Ответ:

- natural selection; environment; B-help; - evolutionary changes; - species of plants and animals3; - unique material for biological research; - reproduction; essential (important) part; - depend on .; - Gain knowledge; - specific properties; -components of a living cell; hereditary diseases; - gene mutations; malignant tumor; - chromosomes; -cytoplasm; - lethal dose of cell nucleus; cancer cells - cell division