The pre-embryo becomes a hollow ball of cells with a fluid-filled cavity by about day 6 of development. This stage is called a ________

A) blastula B) blastocyst C) blastocoel D) morula


Answer: B

Biology & Microbiology

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Which important discovery in the early 1900s enhanced food production, thus increasing human population growth?

a. cultivation of rice b. cultivation of wheat c. the wheel d. synthetic fertilizer e. penicillin

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Primary growth (lengthening) arises from ____________________. Fill in the blank(s) with the appropriate word(s)

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What stage of sewage treatment produces methane?

A) primary treatment B) secondary treatment C) tertiary treatment D) sludge digestion E) None of the stages of sewage treatment produce methane.

Biology & Microbiology

Surface tension tends to ______________________

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

Biology & Microbiology