Which of the following organisms is not in the phylum Echinodermata?

a. brittle star

b. lancelet

c. sea star

d. sand dollar

What would be the most obvious outcome of repeated cell cycles consisting of s phase and m phase only?

A researcher observes two species of frogs in the same area. Both species have a similar diet. One species breeds in fast-moving streams, while the other species breeds in ponds. Both species are similar in appearance and have very similar DNA.

What causes diffusion? i have a test to study for in biology and the only thing i dont get is what causes diffusion.?

Lily feels tired and weak in the evening after work before starting her chores she eats dinner which characteristics of life does lily exhibit

Which of the following is a nonrenewable resource? A. oil B. solar energy C. wind power D. hydro power

Which statements describe functions of antibodies? Check all that apply. They maintain the cell's shape. They regulate cell processes. They protect the body from infectious agents. They signal the immune system to destroy pathogens.

Which event results in massive flooding? a landslide an earthquake a tornado a tsunami

What three kinds of variations among organisms did Darwin observe during his voyage?

What general trends characterized the evolution of Homo cranial morphology? a) increasing cranial capacity and more oval-shaped crania through time b) decreasing cranial capacity and more oval-shaped crania through time c) increasing cranial

Explain what process the a cell must use to allow a protein to enter and why?