Answer: Leaves in a cactus are modified into spines to reduce loss of water from leaves by transpiration. Then the plant makes from the process of photosynthesis which is performed by the stem.
Explanation:
I think it is D because your responding to the cold from stimuli and by creating heat to keep your body the average temperature it is homeostasis.
Answer:
A. the cell membrane protects the cell
I think the correct answer from the choices listed above is option A. It is the alveoli that is composed of single layer <span>surrounded by a network of capillaries. These are used to allow oxygen and carbon dioxide to move from the lungs to the bloodstream.</span>
Probably to not contaminate food or accidentally poison it.