The first autotrophs probably were _____ and produced _______.

A. photosynthetic, oxygen.
B. photosynthetic, no oxygen.
C. eukaryotic, oxygen.
D. eukaryotic, no oxygen.


Ans: B. photosynthetic, no oxygen.

Biology & Microbiology

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Based on the colligative properties of water, what would happen if one were to add a solute to water?

A. The freezing point of water would decrease. B. The freezing point of water would increase. C. The boiling point of water would increase. D. Both the freezing point of water would decrease and the boiling point of water would increase. E. Nothing would change with respect to the freezing point or boiling point of water.

Biology & Microbiology

All animals are

a. multicellular, heterotrophic, and diploid. b. multicellular, heterotrophic, and haploid. c. multicellular, autotrophic, and diploid. d. multicellular, autotrophic, and haploid. e. unicellular, autotrophic, and haploid.

Biology & Microbiology

Which cartilage forms the "Adam's apple"?

a. cricoid b. cricothyroid c. thyroid d. meniscus e. fibrocartilage

Biology & Microbiology

Of the four main tissue types, the type known as ________ covers body surfaces and lines body cavities and organs

Fill in the blank(s) with correct word

Biology & Microbiology