Nitrate pollution in groundwater is most dangerous to older adults

wildlife

infants

children age 12 to 18

Nutrients that our bodies need in small amounts are called

One way the immune system fights pathogens

How do animals get the carbon atoms to form the CO2 molecules that they exhale? A: from oxygen they take in B: from glucose they eat C: from carbon dioxide they inhale

Which of these best describes what occurs during cytokinesis? Select one: a. The nucleus opens to allow the chromosomes to enter the cytoplasm. b. The chromosomes are separated. c. The cell begins to divide by replicating the chromosomes. d.

Explain why the tongue can be considered the muscle with the greatest strength endurance.

The process of heat transfer thought to be responsible for the movement of the lithospheric plates on the surface of the earth is

6, Humans can be infected with the HIV virus for many years without showing any signs or symptoms, How is this possible?

Give one fact about cytoplasm of an unfertilized egg

What is the difference between predator and prey?

Summarize how one species become two different species