Once the fertilized ovum has divided into two cells, it is called the ________
Fill in the blank(s) with correct word
pre-embryo
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In order to take up a naked DNA molecule, a cell must be ________, which may occur only at certain stages in the life cycle of the organism.
Fill in the blank(s) with the appropriate word(s).
The number of individuals of the same species
in some specified area or volume of habitat is the
a. population density. b. population growth. c. population birth rate. d. population size. e. carrying capacity
As the degree of environmental heterogeneity of a community increases, the number of plant and animal species tends to
A) decrease. B) remain the same. C) increase. D) increase initially and then decrease.
All of the following are characteristics of life EXCEPT
A. evolution. B. reproduction. C. homeostasis. D. multicellularity.