. Two methods of moving from place to place are represented below. The single-celled ameba moves by a process that involves the flow of cytoplasm. Which statement is best supported by these diagrams? * 1 point
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1. Both simple and complex organisms move directly by the movement of cytoplasm.
2. Single-celled organisms, like complex organisms, are able to move; however, they differ in the way they carry out this activity
3. Cytoplasm is a fluid substance in simple cells and a solid substance in cells of complex organisms.
4. Cells in complex organisms function in the exact same way as cells in simple organisms.

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

Which of the following is a common response to cell signaling?

Hershey and chase confirmed that dna, not protein, was the genetic material. how do the results of their two experiments support this conclusion?