Stromatolites are

A. layered rocklike structures formed by cyanobacteria.
B. the earliest known arthropods.
C. autotrophs living around deep sea vents.
D. heterotrophs found in marine environments.
E. fossilized coral reefs.


A. layered rocklike structures formed by cyanobacteria.

Biology & Microbiology

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All gills

a. consist of overlapping rows of filaments. b. are external. c. are paired. d. are associated with a blood transport system. e. fit all of these descriptions.

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Select all of the following statements that describe the structure of a molecule of DNA.A) twisted double helixB) single-strandedC) contains the nitrogenous bases, adenine, thymine, cytosine, and guanineD) contains deoxyribose sugarE) contains the nitrogenous bases adenine, uracil, cytosine, and guanine

What will be an ideal response?

Biology & Microbiology