The structure in Figure 27-3 labeled 4 is:
a. haploid.
b. diploid.
c. polyploid.
d. a zygote.
e. produced by meiosis.
A
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Which of the following hormones stimulates uterine contractions during the birth process in mammals?
A. oxytocin B. testosterone C. FHS D. chorionic gonadotropin E. LH
The tropics are a region where air
A) descends and warms, dropping rain. B) descends and warms, creating an arid belt. C) rises and cools, creating an arid belt. D) rises and cools, dropping rain.
The cell is the basic structural/functional unit common to all living organisms.
Answer the following statement true (T) or false (F)
How do mycorrhizae benefit plants?
a. Mycorrhizae increase a plant’s flowering. b. Mycorrhizae increase the surface area of the leaves. c. Mycorrhizae increase a plant’s rate of photosynthetic. d. Mycorrhizae increase a plant’s absorptive surface area of roots. e. Mycorrhizae increase the number of chloroplasts within a plant.