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Questions in biology

[Done] What are the three main functions of the nervous system? Give an explanation of each.

[Done] What would happen if the keystone species of hummingbirds were removed from their ecosystem?

[Done] What are the three structural components of a nucleotide? A. A carboxyl, a sugar, and a phosphate B. A phosphate, an amino acid, and a carboxyl C. An amino acid, a carboxyl, and a phosphate D. A sugar, a phosphate, and a nitrogenous base E. A nitrogenous base, an amino acid, and a sugar

[Done] What are three differences between univalves and bivalves?

[Done] Which structure allows photosynthesis to begin in a germinating dicot plant? A. Cotyledon B. Endosperm C. Embryonic root D. Apical meristem E. Lateral meristem

[Done] Very thick stems are specialized for: A. Clinging and climbing B. Strength and support C. Storing water or food D. Photosynthesis

[Done] What two ideas from geology were important to Darwin's thinking?

[Done] What effect does temperature have on the characteristics of magma?

[Done] How can a clam function with such a simple nervous system?

[Done] i just need help with this i dont get it