Which of the following are primary lymphoid organs?

a. bone marrow and thymus

b. appendix and spleen

c. lymph nodes and tonsils

d. spleen and thymus

Part of the dermal tissue that is made of hard, dead, cork cells is the

Scientists often replicate the experiments that other scientists have already performed. That is, they reproduce an experiment by using the same procedure and materials as another investigator.

Describe three ways in which eukaryotic plant cells and eukaryotic animals cells are different

What type of carbohydrate forms chains

Natural gas forms from the remains of buried plants and animals. a. True b. False

How would you solve 5x + x - 3x > - 12

How can individuals play a role in the evolution of an entire species

Which of these are found in the lymph? A. red blood cells B. white blood cells C. antibiotics D. platelets

The visual predation hypothesis proposes that:a) better vision allowed for better access to fruits and small insects b) primate traits arose as adaptations to preying on insects and small animals c) species could see predators from farther away,

A researcher wants to know whether children eating a high-protein breakfast will have a higher test grade. half of the children in the study eat a high-protein breakfast while the other half eats their normal diet.