An immature male gametophyte is called a(n) _________.
A. Pollen tube
B. Megasporangium
C. Pollen grain
D. Naked seed
E. Ovule
Ans: C. Pollen grain
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The proposal that one type of organism can change gradually into another type over a long period of time is known as:
A. preconception. B. preservation. C. natural history. D. evolution.
Experiments on selective adhesion between ectoderm, mesoderm, and endoderm derived from amphibian embryos
demonstrated that ____.
a. ectoderm cells have positive affinity for mesoderm cells but negative affinity for endoderm cells b. ectoderm cells have negative affinity for mesoderm cells but positive affinity for endoderm cells c. mesoderm cells have negative affinity for endoderm and ectoderm cells d. ectoderm cells have positive affinity for both endoderm and mesoderm cells e. endoderm cells have positive affinity for both ectoderm and mesoderm cells
Individuals of a(n) __________ share a gene pool. Fill in the blank(s) with the appropriate word(s)
Marsupials are egg-laying mammals
Indicate whether the statement is true or false