The two main functions of the lymphatic system are
A) coagulating blood and fighting infections.
B) producing hormones that regulate the immune system and coagulating blood.
C) producing hormones that regulate the immune system and fighting infections.
D) returning tissue fluid to the circulatory system and fighting infections.
Answer: D
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Newborn infants can be infected with Group ________ streptococcus during birth.
Fill in the blank(s) with the appropriate word(s).
An increase in the size of the ozone hole would be expected to _____
a. increase skin cancers b. reduce respiratory disorders c. both a and b
Formation of a tetraploid plant species from two different diploid parental species of plants is an example of
A. punctuated equilibrium. B. gradualism. C. extinction. D. a postzygotic barrier to evolution. E. a prezygotic barrier to evolution.
Who developed a theory of evolution almost identical to Darwin's?
A) Lyell B) Wallace C) Aristotle D) Malthus