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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

Devise an example of a food chain with four links.

What will be an ideal response?

Biology & Microbiology

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.

Biology & Microbiology