12. About 85% of the world's is still produced by nuclear fission and burning fossil fuels.
A. oil
B. Natural gas
C. Coal
D. Electricity

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

Which statement about the immune system is false? a. lymphocytes reduce inflammation, b. b cells remember specific pathogens. c. most white blood cells kill bacteria d. white blood cells are made in lymph nodes.

Which of the following is not considered an appendage of the skin? nails glands follicles none of the above