Cells
Ecosystems
Protein Synthesis
Populations
Scientific Reasoning
100

This lacks a membrane-bound nucleus

Prokaryote cell

100

The evolution of a quantity over time

Growth curve

100

A process in which parent cells divide into two or more daughter cells

Cell division

100

When organisms better adapted to their environment tend to survive and produce more offspring 

Natural selection

100

This is the purpose of variables

Test the hypothesis
200
This directs and coordinates all cellular activity 
Nucleus
200

This causes a noticeable change in an output or other measure of a type of system

Limiting factor

200

Carries genetic instructions

DNA

200

These are preserved remains, impression, or trace of any once-living thing from the past

Fossils

200

The type of data expressing amount, quantity, or range

Quanitative

300

This is the powerhouse of the cell

Mitochondria

300

Process of change in the species structure of an ecological community over time

Ecological succession 

300

DNA and RNA are examples of 

nucleic acids

300

The interactions between organisms or species in which both the organisms or species are harmed

Competition

300

Being logical or factually sound

Validity

400
These are tiny cellular structures that preform specific functions within a cell

Organelles

400

A change by which an organism or species becomes better suited to its environment 

Adaptation

400

A germ cell undergoes two fissions, resulting in the production of four gametes 

Gamete formation
400

This is the difference in DNA sequences between individuals within a population

Genetic variation

400

The system of ideas intended to explain something

Theory

500

This separates the interior of all cells from the outside environment

Plasma membrane

500

The maximum population size of the species that the environment can sustain indefinitely 

Carrying capacity
500

This is when generic cells change into specific cells meant to do certain tasks within the body 

Cell specialization

500

The change in the heritable characteristics of biological populations over successive generations

Evolution

500

The variable that is changed or controlled in an experiment 

Independent variable