In the process of alternation of generations, the _____
A) sporophyte is haploid and produces gametes
B) sporophyte is diploid and produces spores
C) gametophyte is haploid and produces spores
D) gametophyte is diploid and produces gametes
E) spores unite to form a zygote
Answer: B
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During the Carboniferous Period, the competitive
edge was held by plants a. with well-developed gametophytes. b. with cuticles. c. with lignin-reinforced tissues. d. with underground stems. e. that produced seeds.
Arrange the stages of sperm development in chronological order
1) sperm 2) spermatid 3) primary spermatocyte 4) secondary spermatocyte 5) spermatogonium a. 5 ? 2 ? 3 ? 4 ? 1 b. 5 ? 3 ? 4 ? 2 ? 1 c. 2 ? 3 ? 4 ? 1 ? 5 d. 2 ? 5 ? 3 ? 4 ? 1 e. 3 ? 4 ? 5 ? 2 ? 1
Ion levels in the extracellular fluid are adjusted by which of the following?
A. thirst B. perspiration C. ingestion D. excretion E. all of the above
Hypotheses for the cause of autism spectrum disorders include or have included in the past ________
A) genetics B) aberrant parenting C) vaccinations D) all of the above