Which of the following adaptations to life on land is found in both insects and modern reptiles?

A) two pairs of walking legs

B) tracheae to distribute oxygen

C) body surfaces that resist evaporation

D) metamorphosis from a larval form

E) ability to fly

How does the sperm cell meet and egg cell

If only one scientist has an idea, is the idea a scientific theory

What happens to a population of predators, perhaps a pride of lions, if their prey, say the gazelle population, in their area was to suddenly decline? How would this affect the pride? How would the pride have to survive?

Which statement best illustrates a factor that affects a protein's function? A) Amino acids link through peptide bonds, forming proteins.

A farmer mated two ducks. They produced three offspring. Two of the offspring were then selected to mate with each other because they had desirable traits.

True (bubble A) or False (bubble B) : Mutations caused by UV light will favor mutations that cause changes to protect the cell from UV light

Cartilage is part of the skeletal system. True False

Which is made up of organic molecules? copper electrical wires plastic storage containers table salt antacid

How does nitrogen leave a food chain? A. Primary consumers eat nitrogen-containing green plants. B. Producers absorb nitrogen-containing nutrients by their roots. C. Decomposers break down nitrogen-containing waste material from primary consumers. D.

Diffusion is important for living organisms because ...