Which are two kinds of echinoderms that use tube feet for movement? sea cucumber and brittle star brittle star and sea star sea star and sea urchin sea urchin and brittle star

What is the next step in muscle contraction after the actin changes shape? (apex)

Plants transfer carbon in the carbon cycle a. through assimilation of carbon from the soil. b. when carbon transpires from their stomatae. c. when they are eaten by animals. d. through fixation of carbon in the soil.plants transfer carbon in the carbon cycle a. through assimilation of carbon from the soil. b. when carbon transpires from their stomatae. c. when they are eaten by animals. d. through fixation of carbon in the soil.

What is characteristics of the troposphere