When does a community undergo succession1. after major ecological changes2 when all its animal life is destroyed3 every few years until it is stable

When elements that form a mineral dissolve in hot water, they form a mixture called a(n) a)geode b)vein c)evaporation d)crystallization e)magma f)lava g)solution h)gem

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine