When huge numbers of species die out in a short period of time, it's known as a mass extinction.

a. True

b. False

Accommodation for near vision requires: 1. flattening of the lens. 2. contraction of the ciliary muscles. 3. activation of the sympathetic nervous system. 4. increased rounding of the cornea. 5. dilation of the pupil.

Why is the frequency of X-linked disorders greater in males compared to females? A. the X chromosome in a male is more likely to carry a dominant disorder. B. the Y chromosome does not carry genes to counter a defective gene on an X chromosome. C.

Explain how living things recycle oxygen in earth's atmosphere.

There are 500 sheets of printing paper in a pack. Juan notes that the thickness of 500 sheets is 1.3 inches. The thickness, in inches, of a single sheet is given by the expression A) 1.3 divided by 500 B) 1.3+500 C) 500x1.3 D) 500divided by 1.3

Witch of the following cells is formed by meiosis

Which is an example of commensalism in the tropical rainforest? a. parasites feed on the sloth's body. b. sloths are food for other animals. c. algae live in a sloth's fur, providing it with camouflage. d. insects lay eggs in the sloth's waste.

Most of the energy in the United States comes from: fossil fuels hydroelectric plants solar power nuclear power

Georgia's salt marshes have been identified as one of the most extensive and productive marshland systems in the United States.

Which type of substances serves as a catalyst for reactions that break large food molecules into smaller useful molecules

Amir suffered a severe brain injury in a motorcycle accident and was partially paralyzed on the left side of his body. after several months of intensive physical therapy, he gradually regained the use of his left leg and arm.