What organic compound makes hair and fingernails?

The phylum with endoderm, mesoderm, and ectoderm is a. Cnidaria. b. Porifera. c. Platyhelminthes. d. all of the above.

How does the nucleus and ribosomes work together to carry out homeostasis?

Which kind of diagram shows the flow of energy between trophic levels in a community? A. Pyramid of biomass B. Energy pyramid C. Pyramid of numbers D. flow pyramid

If Earth's atmosphere did NOT contain any water vapor, the temperature of the earth's surface would

How does an electric eel live in tropical rainforest

What must happen before the cell can go through mitosis? Interphase.

Belle's grandfather lives in a region where the temperature drops below 0*F at night. When belle visited her grandfather, they hiked up a hill. Belle noticed that a lot of rock had cracks in them.

The genetic condition of an organism that has two identical alleles for a given trait.

Which level of biological classification is the lowest level that butterflies

What might happen if a continent stops rifting apart?