Veins .

produce red blood cells
are only found in the heart
usually carry deoxygenated blood
carry blood away from the heart

There is only one answer.

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

Which of the following is the source of energy for photosynthesis? a.) glucose b.) chlorophyll c.) carbon dioxide d.) sunlight

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.