Answer:
the pupil is the correct answer please mark as brainliest
Explanation:
The pupil is the small opening in the center of the iris through which light initially passes.
Answer:
Depending on the size, some substances are able to pass through cell membranes
Explanation:
Some molecules, such as hydrocarbons and oxygen can cross the membrane. Many large molecules (such as glucose and other sugars) cannot. Water can pass through between the lipids.
Hope that answers your question.
Answer:
Cells have different shapes because theydo different things. ... The shapes ofcells have evolved to help them carry out their specific function in the body, so looking at a cell's shape can give clues about what it does. Neurons are cells in the brain and nervous system.
An independent variable is a variable which change is not affected by that of another variable. By process of elimination you can take out B and C. An independent variable can also change so that takes out A. That leaves D.
Answer:
Actin filaments return to their original positions (does not occur in muscle contraction, according to the sliding filament model).
Explanation:
