Which of the following did not occur during Precambrian time?

A. ancestors of all modern animals appeared

B. O2 accumulated in Earth's atmosphere

C. eukaryotes arose

D. photosynthesis evolved

E. life originated


A. ancestors of all modern animals appeared

Biology & Microbiology

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Conservation biology includes

a. a survey of biological diversity. b. maintaining biodiversity to benefit human populations. c. ecological considerations of diversity. d. an effort to maintain biodiversity. e. all of these

Biology & Microbiology

A crystal of potassium permanganate is placed into a beaker of water. The next day, the solid color is gone, but the water is evenly colored. This is an example of

What will be an ideal response?

Biology & Microbiology

The ________ continually senses and adjusts our body systems to maintain homeostasis

Fill in the blank(s) with correct word

Biology & Microbiology

Which protist group does not have flagellated cells?

a. water molds b. brown algae c. golden algae d. euglenoids e. red algae

Biology & Microbiology