Which is one cause of speciation?

1. Populations become infertile.

2. Populations are morphologically separated

3. Populations become reproductively isolated.

4. Populations interbreed.

If element X has 49 protons, how many electrons does it have?

Which of the three muscle cell types has multiple nuclei?

What is not an advantage of using the pyramid of energy

In pea plants, yellow seed color (Y) is dominant and green seed color (y) is recessive. Based on the Punnett squares, what are the chances that the offspring in the second generation will have green seeds?

You are the scientific consultant for a television show about forensic analysis. In an upcoming episode, investigators will compare the DNA of a suspect and a DNA sample collected from the victim's fingernails.

Immunoglobulins are produced by which leukocyte? A. Monocytes B. B lymphocytes C. T lymphocytes D. Plasma cells

In the ecological pyramid, organism A represents a

Mica has one direction of ___ so it breaks into sheets.

Which state looks like it has an area shaped like the heel of a boot?

Why might the hyperkalemia stimulate aldosterone secretion?