When blood calcium levels are too low, the hormone _____ is released, which stimulates osteoclasts to break down bone and release calcium into the blood

calcitonin
growth hormone
estrogen
parathyroid hormone


D. parathyroid hormone

Biology & Microbiology

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In the original experiments by Stanley Miller and Harold Urey to synthesize organic molecules in an abiotic environment, which one of the following would you NOT expect to find in the collection flask?  

A.  urea B.  amino acids C.  ATP D.  adenine E.  formaldehyde

Biology & Microbiology

A ripened ovary is called a(n)

a. endosperm. b. fruit. c. ovule. d. seed

Biology & Microbiology

A(n) _____ is a general term for the site of infection or disease

a. infection b. lesion c. disease d. sequela

Biology & Microbiology

Which is most closely related to the hagfish?

A) Shark B) Tunicate C) Lamprey D) Lancelet

Biology & Microbiology