The term "natural selection" is not interchangeable with the term "evolution" because:
A) a population may evolve in ways other than through natural selection.
B) Darwin coined the term "natural selection," but not "evolution."
C) natural selection is just a theory, whereas evolution has been proven.
D) natural selection does not always lead to evolution.
Answer: A
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When does a zygote become a multicellular creature?
a. at fertilization b. when cleavage begins c. when organs begin to form d. when the heart begins beating e. at birth
A color-blind, chromatin-positive male child (one Barr body) has a maternal grandfather who was color blind. The boy's mother and father are phenotypically normal. What needed to occur to have this genetic outcome?
A) The mother is homozygous recessive and underwent nondisjunction in meiosis I or II. B) The mother must be heterozygous and underwent nondisjunction at meiosis II. C) The chromosomal doubling effect of meiosis II occurred in the father. D) Nondisjunction in meiosis I of the father occurred. E) The mother must be heterozygous and underwent nondisjunction at meiosis I.
In MDCs, many people do not eat enough protein.
Answer the following statement true (T) or false (F)
Which of these traits distinguishes Holocephali from sharks and rays?
a. flattened bodies b. enlarged pectoral fins c. a lack of scales d. swim bladders