How are scientists able to use fossils of extinct organisms as evidence? a. fossils show exactly how all extinct organisms are related to all organisms alive today. b. fossils provide weak evidence and are rarely used to show ancestry and relationships to present-day organisms. c. fossils can scientists trace physical changes and compare how organisms looked over time. d. fossils that are deeper in the earth provide better evidence than fossils that are found closer to the surface.

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

Ateam from new york presbyterian hospital is conducting a study about a recent increase in cases involving both excess sweating and kidney stones. what would the team need before it draws a conclusion about the cases? medications that are specifically designed to treat the sickness machines that are built to process blood and reduce symptoms until patients are healthy again data that profile the various patients who report these symptoms proof that the excess sweating is related to the excessive kidney stones

According to this food web which of the following would be considered primary consumers