Veins have a much lower blood pressure than arteries. Which of these prevents backflow of blood in veins?

A. pressure applied by the heart

B. one-way valves in veins

C. thin muscular walls of veins

Compare how cell store and release energy using ATP

What is a dynamic character? A. one who remains the same B. one who has many personality traits C. one who has limited personality traits D. one who experiences significant growth or change

Do you think the knowledge of scientific method is only important for scientists? Why or why not? Explain.

What are some factors that cause seismic waves to create?

How does matter move through biogeochemical cycles

What is the junction between a nerve cell and another cell called: axon, synapse, dendrite, none of the above

1. Synthesize Information How do you explain to the horse owner why this foal was born with OLWS while two previous foals were perfectly healthy? What would you tell the new parents of the baby girl about their prospects for having more children?

What organelle is the control center for the cell and holds the DNA

The primary structure of a protein refers to the sequence of amino acids that are linked together in a long chain. Which of the following common items would best represent the primary structure of a protein? O A.

How many chromosomes do humans have? how many copies in normal cells? How many pairs? How many copies in sex cells?