The only group with an endoskeleton is

A) The vertebrates

B) the mollusks

C) arthropods

D) vertebrates

It is easier for a baseball player to hit a baseball farther when a pitcher throws a fastball than when he throws a curveball or a changeup?

Many sexually active american adolescents fail to avoid pregnancy because

Which of the following glands are holocrineglands? a) Pancreas b) Sweat glands c) Salivary glands d) Sebaceous glands

What would most likely be the result of a malfunctioning liver? • difficultly passing urine • inability to grow hair •buildup of toxins •limited feces production

Why do frogs retract their eyes

How does the amount of uranium in zircon tell us how old the crystal is?

Which organism's are omnivores? A) The snake, the bear, and the fish B) The fish and the eagle C) The bear and the fish D) The snake and the mouse If an omnivore is an animal that eats both plants and animals, I'd choose D because all the other

How are all humans similar?

Why does earth have such a diversity of plant and animal life? give three reasons.

After sequencing a molecule of dna, you discover that 20% of the bases are cytosine. what percentage of the bases would you expect to be thymine? explain why.