Clams and other bivalves typically have:a
dermal gills.
b. gills adapted for trapping food.
c. an operculum.
d. book lungs.
e. swim bladders.
B
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The cause of schistosomiasis is a ____
a. fluke b. tapeworm c. planarian d. leech e. roundworm
Which of the following statements is false?
a. Crossing over tends to reduce the frequency that two linked genes are inherited together. b. Independent assortment of homologous chromosomes during meiosis increases variation. c. Crossing over leads to variation. d. An abnormal number or structure of chromosomes may influence the course of evolution. e. The closer together genes are found on a chromosome, the greater the chance that crossing over will occur between them.
The transfer of pollen from the male reproductive structure to the female reproductive structure is called
A. ovulation. B. implantation. C. pollination. D. photosynthesis.
How do undifferentiated cells "know" what to become?
What will be an ideal response?