A ball is falling after rolling off a tall roof. The ball has

Which of the following is an endangered species? A. a large population of bears who have to eat a variety of food to survive B. a small population of bears who are the last members of their species C.

What would happen to a cell if the fatty acids in the cell membrane became soluble in water?

Which of the following modifications of a stem provides storage?

To be useful, a scientific hypothesis must: Select one: a. be true. b. be testable. c. be very specific. d. apply in all situations.

Which cell is involved in the immune system

Rubbing the balloons against the woolen fabric or your hair creates static electricity. This involves negatively charged particles (electrons) jumping to positively charged objects.

Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle? A) gamma aminobutyric acid B) acetylcholine C) cholinesterase D) norepinephrine

How does gas like oxygen get across the cell membrane?

Why are there so few aquatic plants and phytoplankton that live at the bottom zones in the ocean? a. the ocean floor contains many de composers b. most sunlight is absorbed before reaching these levels c. water is limiting factor d.

Which of the following is not a property of a base? Feels slippery to the touch Changes red litmus to blue Has a sour taste Produces OH - ions