The first mammals reproduced by means of
A. an egg.
B. a pouch.
C. a placenta.
D. asexual reproduction.
A. an egg.
You might also like to view...
Alternation of heteromorphic generations
(a) is found only in the bryophytes. (b) is common to all land plants. (c) is typical of most green algae. (d) occurs in the liverworts but not mosses.
How is the Ames test for mutagenicity useful for identifying potential carcinogens?
A) Bacteria do not get cancer so they can survive lethal carcinogens. B) Substances that mutate bacterial DNA are likely to mutate human DNA. C) Bacteria thrive on substances that could cause cancer in humans. D) The same genes that cause cancer in humans can be mutated in bacteria. E) Liver enzymes alter the bacteria so they will behave like human cells.
Plants adapted to high-nutrient environments have higher growth rates than plants adapted to low-nutrient environments
Indicate whether the statement is true or false
Cells that have developed an enlarged nucleus and lost some specialized structures and functions, but is not yet cancer, is called ________
Fill in the blank(s) with correct word