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.
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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
The drug(s) used to treat genital herpes is/are
A. penicillin. B. erythromycin. C. acyclovir. D. famciclovir. E. acyclovir AND famciclovir
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
Which of the following is heterosporous?
a. whisk fern b. spike moss c. horsetail d. liverwort e. hornwort