Which statement is true of Y chromosomes?

A. Only men have them.

B. Women have two of them.

C. Only women have them.

D. All babies have them.

Explain how organisms, including humans, use natural resources.

transverse and longitudinal waves both a. have compression and rare factions b. transfer energy through a medium c. move at right angles to the vibration of the medium D. are capable of moving a medium long distance

What does chloroplast do in a plant cell?

Which of these animals is on the Endangered Species List? a. Deer b. Blue Jay c. Holstein Cow d. Florida Panther

What is leeuwenhoek most marvelous discovery?

Rubidium-87 has a half-life of 48.1 billion years. After how many years is there 25 percent parent isotope and 75 percent daughter isotope contained in the object?

In what layer are convection currents found? A. Continental crust B. Inner core C. Asthenosphere D. Oceanic crust

The major organs which control acids and bases in the body are: Select all that apply.

What is it called when some traits require more than one gene to be fully expressed?

An animal which eats only animals is called a (n) : carnivore herbivore omnivore scavenger