When a tourist buys a sand dollar at a beach shop, what are they buying?
A. A calcium carbonate shell secreted from the mantle
B. Anendoskeleton of calcium carbonate ossicles
C. A molted exoskeleton made of chitin
D. An endoskeleton made of bone
E.An endoskeleton made of cartilage
B. Anendoskeleton of calcium carbonate ossicles
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Which of the following is a correct sequence of processes that takes place when a flowering plant reproduces?
A) meiosis ? fertilization ? pollination ? germination B) fertilization ? meiosis ? nuclear fusion ? formation of embryo and endosperm C) meiosis ? pollination ? nuclear fusion ? formation of embryo and endosperm D) growth of pollen tube ? pollination ? germination ? fertilization E) meiosis ? mitosis ? nuclear fusion ? pollination
A newborn girl’s ovaries contain about how many primary oocytes?
a. 300 b. 1000 c. 20,000 d. 200,000 e. 2,000,000
Devise an example of a food chain with four links.
What will be an ideal response?
Transmission of the pathogen of leishmaniasis is by the
A. tsetse fly. B. phlebotomine (sand) fly. C. reduviid, "kissing," bug. D. hard bodied tick. E. Anopheles mosquito.