Stromatolites are rocklike columns composed of:

a. protists
b. dinoflagellates
c. microbial biofilms
d. heterotrophic organisms
e. photosynthetic eukaryotes


c

Biology & Microbiology

You might also like to view...

Chemical evolution concentrated the various smaller molecules into the more stable forms

a. True b. False Indicate whether the statement is true or false

Biology & Microbiology

In humoral immunity, cells that are produced by activated B cells and function by secreting antibodies are called

A. cytotoxic T cells. B. helper T cells. C. plasma cells. D. macrophages. E. memory cells.

Biology & Microbiology

There are _____ microbial cells living on and in our bodies compared to the number of our body cells

a. ten times more b. ten times less c. about the same number of d. about half as many e. 100 times more

Biology & Microbiology

A second messenger, such as cyclic AMP, carries a hormonal signal to molecules inside a cell

Indicate whether the statement is true or false

Biology & Microbiology