A factor that lowers the likelihood of success when using IVF is

A) advanced maternal age.

B) number of previous failed IVF attempts.

C) increased time being infertile.

D) All of these are correct.


D) All of these are correct.

Biology & Microbiology

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Which of the following is NOT a general category of cell signaling molecules?

Endocrine signaling Enzymatic signaling Paracrine signaling Synaptic signaling

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Of the following hominin species, from which did H. sapiens derive?

a. H. habilis b. H. rudolfensis c. H. heidelbergensis d. H. ergaster e. H. erectus

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Which of these is a heterotroph?

A. a phytoplanktonic diatom B. a fish C. an oak tree D. a corn plant E. a moss plant

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In nitrification, when electrons are donated to an electron transport chain from nitrite, the nitrite is oxidized to ________, with ________ serving as the terminal electron acceptor.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology