Which of the following organisms first introduced oxygen into Earth's atmosphere?

A. cyanobacteria

B. methanogens

C. early protozoans

D. plants

E. green algae

The largest population that a given ecosystem can support at any time is the

What are the steps of DNA in the correct order (1,2,3)

Reproducing asexually has some major advantages including all the following except: ... A] rapid rate of reproduction. B] ability to inhabit an area rapidly. C] genetic variability. D] no time spent on finding a mate

How is hyaline cartilage different from elastic cartilage or fibrocartilage?

Why isn't the fit "perfect" if the continents were once part of Pangea

1. the idea that the sporophyte generation and the gametophyte generation follow one another in alternating fashion perennial 2.

What are currents?

Which change to one of the kits would make it useful for modeling proteins?

Whitch tow forces do siectests belive are responsible of tectonic plate motion

If carbon dioxide disappeared from the biosphere which organism would first experience negative biology affect