(Q).
Cancer is a disease in which cells divide out of control, and with specific types of gene damage, the cell starts dividing out of control, forming a tumor. Given these facts, cancer and tumors are a result of specific types of: among the following options: - organs - cigarettes - radiation - layers of fat - gene damage - rays or beams - Chemical energy - the skin
(A).
gene damage

(Q).
Damming a river can cause a lake to form, and nothing alters a river as totally as a dam. Given these facts, what can a dam form among the following options: - fens - rain - lake - water - cracks - H2O - valley - canyon
(A).
lake

(Q).
Active immunity results when an immune response to a pathogen produces memory cells, and pathogens are germs that cause disease. Given these facts, active immunity is when an immune response occurs after a germ produces what among the following options: - harmful substances - bioaerosols - rapid expansion - Allergies - anemia - it needs them - Chemical energy - memory cells
(A).
memory cells