Eagles build nests, like the one shown. How does this behavior affect the survival of the eagle population?
A. It communicates to the offspring the best way to reproduce.
B. It helps attract a mate and produce offspring.
C. It signals that the bird is ready to mate and produce offspring.
D. It provides a safe place for offspring to grow.

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone

Cancer cells spread to other parts of the body by entering the bloodstream. which of the following organs could prevent a cancer cell in the bloodstream from spreading, and why? a. the spleen, because it releases lymphocytes into the blood b. the peyer's patches, because they release lymphocytes into the blood c. the lymph nodes, because they release lymph into the blood d. the thymus, because it releases lymph into the blood

List the four types of organic compounds found in all living things and explain why they are important.