What is the most primitive group of fishes and what is the defining characteristics of animals in this group?

How oxygen got into our atmosphere

Which kind of organism does not generally require oxygen or sunlight to survive

Which statement best describes how this ecosystem changes during primary succession? A. Annual plants increase as small trees decrease. B. Shrubs and grasses increase during the middle stages. C.

Explain how surface mining affects plant life.

Heroin is a chemically modified form of what drug?

What symptom of schizophrenia is illustrated by the following example? So bees with knees have fleas and fleas jump, I jump like a jack, Jack the Giant Killer.

During meiosis, sister chromatids are separated and move toward opposite ends of the cell as the centromeres that hold them separate. Which of the following processes will begin next? - Prophase I - Metaphase II - Anaphase I - Telophase II

While caring for a patient undergoing suctioning, the nurse guides the catheter along the naris floor to avoid the turbinates. which outcome observed by the nurse supports the intervention?

What best describes where the sicentists who have contributed to our scientific knowledge were located A) they were mostly from Europe B) they where from all parts of the world C) they were mostly in the United states D) they were from Asian

All living organisms are composed of O A. only one cell. OB. at least three cells. OC. one or more cells. OD. at least 100 cells.