How many different amino acids are known?

Where is the DNA located in a male sperm cell? A. In the sperms tail. B. On the outer membrane of the sperm cell. C. The sperm cell nucleus. D. The sperm cell inner membrane. What is the final destination of the sperm cell? * A. Another sperm cell.

Why would a lizard be on a rock?

What does Lithium and Boron have in common on the Periodic table

Which type of protist is most like a fungus

How do electromagnets differ from regular magnets? A. They can be turned on and off B. Their polarity can be reversed C. Their strength can be changed D. All of the above

Will the amount of hydrogen in our sun increase or decrease over the next few million years?

How does gravity cause plates to move? Explain

Which water-soluble vitamin plays an important role in the formation of collagen? A. vitamin C B. thiamin C. folate D. biotin

What is the theory on how cells came to have mitochondria.

Which of the following lists fits the order of these three descriptions: Age of Mammals, Age of Dinosaurs, and longest geologic time period. Choose one: A. Mesozoic, Cenozoic, Paleozoic B. Cenozoic, Mesozoic, Precambrian C.