Origin of species by means of natural selection
Answer:
B. the variable that is changed and being tested
Answer:
an independent variable is a variable that we choose to change to see that happens. ( eg. the temperature when testing evaporation).
a dependent variable is the variable that we measure. ( so maybe how much water evaporates)
Answer:
The sides of the ladder are made of alternating sugar and phosphate molecules.
Explanation:
