Darwin's ideas on evolution were advanced for his time. His approach to science and natural selection were supported by what main tenet?
A. The world is fixed and constant.
B. Operation of natural laws produces constant change and improvement.
C. Species were unchangeable over the course of time.
D. Various organisms and their structures resulted from a spontaneous action.
Answer: B
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Double fertilization refers to
(a) fusion of two sperm nuclei and two egg cells. (b) fusion of one sperm nucleus with two polar nuclei and fusion of another with the egg cell nucleus. (c) maturation of the ovary into a fruit. (d) none of the above.
The only antibody that can cross the placenta from mother to fetus.
What will be an ideal response?
Which of these provides your body with energy?
a. minerals b. fats c. oxygen d. vitamins e. light
Which are true statements about anaerobic respiration? Check all that apply.
A. lactate may be produced B. a large amount of ATP is produced C. ethanol may be produced D. the reactions happen in the mitochondria E. the reactions happen in the cytoplasm F. CO2 is produced G. NADH is produced