1. Your educated guess
   The data you collect
2. The results you see
   The amount of time the experiment takes

As you formulate an idea for an experiment, one of the first things you come up with is your hypothesis. A strong hypothesis will be completely testable and have a clear answer by the end of the experiment.

1. Organ
   Cell
2. Nervous system
   Brain

Every organism has cells, and every cell is a miniature factory that has a specific function within that organism. Cells reproduce to help the organism regrow or regenerate as well.

1. An animal without a spine
   A single-celled organism
2. An animal with a spine
   Every animal ever

The animal kingdom can be divided into two different categories: vertebrates and invertebrates. Vertebrates include birds, mammals, reptiles and fish, while invertebrates include worms, crustaceans and many insects.

1. Dominant reproduction
   Recessive trait
2. Punnet square
   Mutation

Genetic mutations occur quite frequently but can often go unnoticed. This usually occurs when there is an alteration in the genetic code that produces a new trait that the two parents did not have.

1. The observable characteristics an organism has
   The unseen characteristics an organism has
2. It's another word for recessive trait.
   It's another word for zygote.

While many of us can't tell what is going on in a person's body, we can observe specific characteristics about them. For example, you know what color their hair, eyes and skin are with a simple observation.

1. Mendal's Triangle
   Punnett Square
2. Gene Box
   Marker Notation

Each individual has two alleles that can determine the result of the offspring. When you create a grid with both parent organism's alleles, you can determine the odds of creating an offspring that looks a certain way.

1. 0 degrees F
   12 degrees C
2. Absolute zero
   Hyperfressia

Organisms, gasses and pretty much everything else needs heat or energy to stay in motion. At absolute zero, everything freezes and all motion stops. The temperature for this is 0 degrees Kelvin, or around -459.67 F.

1. All of the stars in a galaxy
   The moons of a planet
2. Planets without a star
   A star with the planets orbiting it

Not every star you see in the night sky is actually considered a solar system. To be a solar system, a star must have planets orbiting it. Science have identified over 2,500 other stars that would be considered solar systems.

1. Core
   Mantle
2. Crust
   Plate tectonics

Although many are trying to access the Earth's core, no one has succeeded yet, and we have yet to sample it. However, we do know that it makes up about 20% of Earth's radius and is molten hot.

1. Volcano
   Earthquake
2. Hydraulic cycle
   Inertia

When you feel a sudden shake or violent jerking motion on the ground, you are experiencing an earthquake. These usually happen near fault lines where tectonic plates are rubbing against each other.

1. Lightning
   Volcanic activity
2. Rain
   Earthquake

Precipitation occurs when the condensation in the water in Earth's atmosphere that gets heavy enough to fall. This can come in many forms, including rain, snow, sleet, hail and graupel (frozen snow pellets).

1. The daily weather conditions in a region
   The cloud formations of a region
2. The volcanic activity of a region
   The average weather conditions of a region

A common misconception is that weather and climate are the same. However, the climate is more of an average of a very long period of time, whereas weather can change on a daily basis.

1. One object is blocked by another
   When the sun fades away
2. When the moon is waxing
   When the moon is waning

While there are many different types of eclipses, there are two that we are most familiar with: lunar and solar. A solar eclipse is when the moon covers the sun, and a lunar eclipse is when the Earth blocks the moon from the sun.

1. Freezing
   Evaporation
2. Mircoannessia
   Nucleoregeneration

When a substance is heated enough, it becomes a gas. This is called evaporation. The easiest and most common way to see this is when you boil water on your stove. The water boils and bubbles because the water on the bottom of the pan is evaporating and needs to escape.

1. The plant life where a species lives
   The estimated living cycle of a species
2. The environment a species is usually found in
   The moon of a planet

The natural habitat of a species generally has everything that species needs to survive. For the most part, species have evolved and adapted to live in the environment they consider their natural habitats.

1. The mass
   The density
2. The whole weight
   The atomic weight

The periodic table of elements shows every element known to humankind. It is organized by the atomic weight of that element, which is usually represented by the number underneath the atomic symbol.

1. The temperature at which a substance becomes a gas
   The temperature at which a substance becomes a solid
2. The temperature at which a substance freezes
   The temperature at which a substance is in its natural state

Once a substance begins to boil, it turns into a gas or vapor. The temperature at the time of this transition is known as the boiling point. Boiling points generally vary by substance, but the majority of substances require high temperatures to boil.

1. Cluster
   Constellation
2. Nebula
   Viscous

The stars that we see from Earth create different constellations than you'd see from other planets. These constellations were used in early exploration as well as keeping track of the calendar.

1. Viction
   Diction
2. Friction
   Fission

Friction is also a way to describe how two surfaces interact with one another. Using friction can create heat or it can change one of the objects, depending on the object that it is rubbing against.

1. Mass
   Exertian
2. Inertia
   Gravity

When it comes to physics, you can usually define gravity as one object being pulled by another object. For example, the sun's gravity keeps the Earth in orbit, while the Earth's gravity keeps the moon in orbit.

1. How a species changes to adapt
   How a species remains the same, despite conditions
2. How a species grows from baby to adult
   How a species is developed before birth

Although there is a debate as to whether or not evolution is real, it has been proven over the years, and species are still evolving to match their changing environments. This is a way to continue life, despite the conditions.

1. Fitochondria
   Mitochondria
2. Phynomisis
   Photosynthesis

The cells in your body function very much like microscopic factories. Scientists discovered that the mitochondria within a cell functions as the place where both respiration and energy production happen.

1. Gas giant
   Solar system
2. Black hole
   Gravitational pull

Black holes are incredibly difficult to study, but astronomers have been fascinated by them since they were first discovered. It is believed that a black hold is formed after a star dies.

1. How long it takes light to travel from Earth to the moon
   The amount of time it takes to generate light from electricity
2. The amount of light necessary to travel from Earth to the moon
   The distance light travels in one year

Light travels very fast. The distance that light, or something traveling at the speed of light, travels in a year is about 6 trillion miles. When broken down, this comes to around 186,000 miles per second.

1. Erosion
   Igneous
2. Fault
   Epoch

Erosion is constantly occurring, and it changes the shape of land as well as the direction a river flows. Erosion even created several large geological formations around the world, including the Grand Canyon.

1. Erock
   Epoch
2. Elnock
   Romoc

Because it takes such a long time for geological layers to be created, epochs are used to help scientists decide the age of certain geological structures and formations. The current epoch is known as Holocene, and we are about 11,500 years into it.

1. A location where the crust is being pushed together
   A location where the crust is remaining the same
2. A location where the crust is being pulled apart
   A location where the crust is getting larger

Rift zones are where two tectonic plates are pulling away from each other. These rifts create long cracks in the Earth's crust and can cause amazing geological occurrences. For example, Lake Baikal is the deepest lake in the world because of the rift zone it's in.

1. A river that flows under water
   A mountain with no trees at the peak
2. A volcano that is inactive
   A hill with a flat top

For those of you who have never lived in the American Southwest, to imagine a butte, think of those large geological structures that look like red and brown buildings that you see on Roadrunner and Wile E. Coyote cartoons.

1. A series of islands that are connected underwater
   A series of channels that connect other waterways
2. A single island in a bay
   A small island on a river

The Glapagos Islands, the Hawaiian Islands and the Florida Keys are all chained islands that are connected underneath. Many archipelagos are volcanic chain islands that are created from volcanoes under the ocean.

1. Stop
   Source
2. Delta
   Sediment

The sources of rivers are also known as the headwaters. Even the largest rivers, such as the Mississippi River, have sources that are rather small. When other rivers feed into these large rivers, they become wider and deeper.

1. Molten rock above the Earth's surface
   An eruption
2. Molten rock under the Earth's surface
   Pressure under a volcano

Magma is always under the Earth's surface. Once it breaks through the Earth's surface and reaches the air, it is then called lava. When volcanoes erupt, magma is usually expelled and becomes lava.

1. A large piece of ice that floats on the sea
   A river that has a bridge
2. A pond that has frozen over
   A large sheet of ice that moves across land

Glaciers can move fast or slow. They can go up to 30 meters per day or as slow as a half a meter in a year. It can take hundreds of years for a glacier to form, as it requires more snow and ice than melts off every year.

1. Unborn offspring
   Pregnant mammal
2. Unfertilized egg
   A birthed mammal

Once the egg is fertilized, it becomes a zygote. As that zygote develops, it becomes an embryo. At the stage of development, the being cannot live on its own, as it doesn't have functioning organs.

1. Pith
   Pistil
2. Stamen
   Glands

That's right! Flowers have sexual organs, but both male and female flowers can be found on the same plant. There are male flowers and female flowers. A pistil is made up of the stigma, style and ovary of a flower.

1. Part of an organism that has a specific function
   It is a musical instrument.
2. The location of genomes
   A rock formation that has been eroded

The human body has over 100 organs that all have very specific functions. Some of these functions are more important that others, but some functions aren't necessary, and removing organs is not unheard of.