Jon is researching the oxygenation of Earth's atmosphere. Which unicellular organism do biologists consider to be the main contributor to that process?

A. paramecia

B. amoebae

C. dinoflagellate

D. cyanobacteria

Answer is D. cyanobacteria

Nonnative species can cause serious problems with marine ecosystem biodiversity. The graph shows a summary of the different methods by which invasive species reach new locations based on United States Geological Survey data as of 2016.

What does cladistic analysis compare

Surface water becomews groundwater when it?

What do you call elements the body needs, but only in small amounts? A. bulk elements B. Trace elements C. Isotopes D. Protons

Students observe two hills, Hill A and Hill B. After a heavy rainstorm, the students observe that Hill A has more loose soil at the bottom than Hill B. Which sentence best describes what most likely caused the loose soil? 1.

Select the correct answer. How is a conductor different from an insulator? A. The free movement of electrons within a conductor permits the transfer of charge. B. The free movement of protons within a conductor permits the transfer of charge. C.

Compare the hibiscus and spider lily pollen grain structure

Which macromolecule is responsible for catalyzing biochemical reactions?

The crystals of a mineral are always the same size.

Suppose two suspects in a crime have dna profiles that match the one dna fragment tested what should happen next