The burning of fossil fuels by cars and factories has most affected the ______________ cycle.

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


Answer: Carbon.

Biology & Microbiology

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The depolarization phase of an action potential requires _____

A) opening of K+ channels in the membrane B) opening of Na+ channels in the membrane C) opening of Ca2+ channels in the membrane D) a K+ concentration gradient across the membrane E) a Ca2+ concentration gradient across the membrane

Biology & Microbiology

The drug(s) used to treat genital herpes is/are

A. penicillin. B. erythromycin. C. acyclovir. D. famciclovir. E. acyclovir AND famciclovir

Biology & Microbiology

Which of the following is heterosporous?

a. whisk fern b. spike moss c. horsetail d. liverwort e. hornwort

Biology & Microbiology

Each DNA strand serves as which of the following during DNA synthesis?

a. replicate b. substitute c. template d. source of nucleotides e. source of sugars

Biology & Microbiology