What is the difference between biological response and biological response modifiers?

Explain why the plants cortex would serve as the best food source for animals

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

What is the membrane that sheath of schwann cell containing cytoplasm and nucleus that encloses myelin