Answer:
False, all plants cells have cell membrane, in addition most of them have also cell wall. They have both
For the first question the answer is D
For the second question the answer is B
Answer:
ATP is responsible for contraction and relaxation in muscles and plays a major role in the muscular system of our body.
Because if we're simultaneously moving/manipulating two different variables it can be very hard to determine why one variable is changing and why the other is changing. While this can be done with more complicated experimental designs, it usually is the case that scientists will only manipulate one variable and not two different ones.
