Members of the Porifera phylum have

a. no skeleton.

b. an exoskeleton.

c. an endoskeleton.

d. either an exoskeleton or endoskeleton, depending on the species.

Excitation of the sarcolemma is coupled or linked to the contraction of a skeletal muscle fiber. what specific event initiates the contraction?

If an organism has alleles BB, it is

Which is the correct sequence of events in the nitrogen cycle? A) soil nitrogen→animals→plants→fungi B) atmospheric nitrogen→bacteria→plants→animals C) soil nitrogen→atmospheric nitrogen→plants→animals D) atmospheric nitrogen→plants→animals→Soil

When coal is burned the chemical energy in the coal is converted to heat energy

What Is the function of nuclei acids

Inhibin secreted by granulosa cells selectively inhibits secretion of FSH by the pituitary a. True b. False

How does the structure of fats enable them to hold so much energy?

Why are fungi unable to live in dry areas? A. They have filaments with small surface areas. B. They cannot trap moisture. C. They have no reproductive structures. D. They are angiosperms.

How does growing beans in a ziplock bag is faster than in a cup with soil?

If blood is in short supply, which blood type would be the most beneficial to have on hand if someone needed a blood transfusion? 1. O+ 2. O- 3. AB+ 4. AB -