The superior and inferior vena cava return blood from the body to which chamber of the heart?

a. left atrium

b. left ventricle

c. right atrium

d. right ventricle

What type of vessel has relatively more smooth muscle and less elastic tissue?

What occurs when a substance reacts with oxygen to form water and carbon dioxide? Explain

When mendel crossed short (tt) pea plants with short pea plants, the offspring were?

Which of the following statements are Jean-Baptiste Lamarck's ideas? Select the two that apply. A. Evolution takes place by small gradual steps. B. Some organisms lived in ancient times, but they no longer exist today C.

An infection in the body might result in a sudden (1) decrease in the activity of antigens produced by the mitochondria (2) decrease in the amount of DNA present in the nuclei of cells (3) increase in the activity of white blood cells (4) increase

How do cells correct errors in DNA that would disrupt their function

Which is true of oxidation? a) It is a physical process b) No change occurs in the makeup of rock c) Rocks weather at different rates d) Water freezes in cracks in rock

What is the function of the pigment molecules in a light-harvesting complex in the thylakoid membranes?

How do natural actions such as weathering, erosion, and soil formation affect Earth's surface?

In which species of animal does sebum eventually become lanolin?