The tiny hollow air sacs in the lungs where gas exchange takes place are the a. alveoli b. lymph nodes c. capillaries d. bronchioles

Rabbits introduced into Australia over 100 years ago have become a serious pest to farmers. Rabbit populations increased so much that they displaced many native species of plant eaters.

Lancelets and tunicates are two groups of chordates. classify each statement as applying to lancelets, tunicates, both lancelets and tunicates, or neither.

All of the organisms are important as producers in the food chain and as producers of oxygen, with the exception of?

only special bacteria can use nitrogen in our atmosphere and "fix" it so other organisms can benefit. what are theese bacterias called?

Large mammals usually has how many offspring at a time?

How does the structure of DNA determine the structure of proteins?

Which sentence correctly compares two solutions that differ by one unit of pH? O A. The acidity of the two solutions cannot be compared using the pH scale. O B. The acidity of the two solutions is the same. C.

Summarize what goes into each photosystem and what comes out of each photosystem; where do these products go?

What process is responsible for most of the heating of the lower atmosphere?

What theory proposes that evolution occurs steadily (slowly) in tiny changes over long periods of time? A. Gradualism B. Relative dating C. Natural selection D. Punctuated Equilibrium