Which of the following organisms has cell walls containing silica? 

A. Ciliated protozoa
B. Archaea
C. Diatoms
D. Dinoflagellates


C. Diatoms

Biology & Microbiology

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Pollen tubes 

A. transport pollen to the stigma. B. facilitate the growth of pollen. C. package sperm into pollen granules. D. allow sperm to fertilize the egg. E. are present during spermatogenesis.

Biology & Microbiology

Lizards and snakes are living members of this lineage

a. Testudines b. Archosauromorpha c. Squamata d. Sphenodontia e. Amphibia

Biology & Microbiology

In what trimester does the baby's skin become smoother as fat is deposited under the skin?

What will be an ideal response?

Biology & Microbiology

Which of the following is a zoonosis caused by a spirochete?

A. bejel B. leptospirosis C. pinta D. syphilis E. yaws

Biology & Microbiology