The endocrineexocrine secretes hormones externally to the skin or mouth

Which of the following nitrogen bases is unique to RNA?

What did you notice about the way the soil particles sank in the water

Describe how selective breeding of wolves has lead to the breeds of dogs we see today?

Which statement best explains the importance of nerve cells. Nerve cells are used to send messages from different parts of the body to the brain. Nerve cells are important in order for growth of an organism.

The concentration of potassium is higher in red blood cells than in the surrounding blood plasma. This higher concentration is maintained by the process of (1) circulation (3) excretion (2) diffusion (4) active transport

What component of a galaxy is the sun an example of?

What is The function of the root cortex

How does information flow from DNA in the cell nucleus to direct the synthesis of proteins in the cytoplasm?

An inference is A. The same as an observation B. A logical interpretation of an observation C. A statement involving numbers D. A way to avoid bias

Why don't populations of organisms that reproduce asexually have the same genetic variation as populations that reproduce sexually? Asexual reproduction uses mitosis but not meiosis. Organisms reproducing asexually only undergo meiosis.