What is one event that marks the end of the Mesozoic era?

A. origin of birds

B. origin of mammals

C. extinction of dinosaurs

D. extinction of angiosperms

Why don't arteries need valves

The parents of a child with cystic fibrosis ask the nurse to explain the sweat test performed on their newborn. how should the nurse respond?

Select all that apply. From the choices below, select the descriptions, plants, and animals that are characteristic of the grassland biome.

The prefix Eco - mean "out", and the prefix endo - mean "in." What do these prefixes tell you about exothermic and endothermic reactions?

What are ways mountains can form along plate boundaries

Which of these activities is not considered to be a marine ecosystem threat? overfishing. ocean pollution. coastal development. ocean alkalinity?

What is another common intramuscular injection site for 2mL or less of a drug? a Ventrogluteal b. Vastus Lateralis c Deltoid d Infraspinatus

Which element acts as a hydrogen acceptor during aerobic respiration? (A) hydrogen (B) carbon (C) oxygen (D) nitrogen (E) phosphorus Can someone explain this one for me?

How do bacteria and viruses differ in the ways they affect cells in the body?

What does high water potential mean?