The human immune system defends the body from pathogens. which of the following are parts of the human immune system ( need asap)

a.) skins, neurons, muscle cells, pancreas
b.) mucous, urine, kidney
c.) skin, lymph nodes, white blood cells, and spleen
d.) white blood cells and red blood cells

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?