Which of the following does not increase the level of nutrients available to crop plants?
A. adding humus to the soil
B. crop rotation
C. plowing crop residues under
D. applying herbicides
E. applying chemical fertilizers
D. applying herbicides
An herbicide is a chemical designed to kill plants and does not increase the nutrient levels of the soil.
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A foreign molecule that causes a specific immune response is a(n) ________.
A. antigen B. antibody C. marker D. PAMP E. hapten
Mammals evolved from which group in the late Triassic period?
a. diapsids b. pelycosaurs c. therapsids d. anapsids
Somatosatin functions to inhibit both insulin and glucagon.
a. true b. false
Answer the following questions true (T) or false (F)
1. A small group of finches on the Galapagos Islands was very important to Darwin in helping him to develop the theory of evolution. 2. Charles Darwin usually gets more credit for the theory of evolution than Alfred Russel Wallace because Darwin thought of the idea first and published a mass of evidence in its support. 3. Alfred Russel Wallace developed his theory of natural selection about 20 years after Darwin.