1. Which of the following is an example of a direct observation? a. Measuring the amount of rain that falls in a 24-hour period in a rain gauge.
b. Estimating the number of rabbits in your garden by examining the number of plants eaten
C. Determining how many people ate the school pizza by looking at trays to see if people threw away their
pizza.
d. Compiling survey results to learn how people feel about a new movie.

According to the loco mass the mass of reactants and products

Tlymphocytes mature in the? a. thyroid gland. b. bone marrow. c. spleen. d. thymus.

Read the following scenario to answer the following question. over the past 60 years, many amphibian species have experienced significant population declines, and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution