Meiosis is a form of cell division that occurs in special types of cells called germ cells. it is different from mitosis because it takes a diploid cell and splits it into four, nonidentical haploid cells. in males, these haploid cells are called sperm and in females they are called eggs or ova. meiosis has two steps: meiosis i and meiosis ii. both steps have their corresponding prophase, metaphase, anaphase, and telophase. meiosis i phases are similar to mitotic phases, with a few key differences. meiosis ii phases are exactly identical to the mitotic phases.

a student is observing a set of cells under the microscope. he takes notes but forgets to write the mitotic phase for each slide. his notes are as follows.

cell a: site of ribosome synthesis disappears

cell b: the nuclear content spills out into the cytoplasm

cell c: no sister chromatids are visible

what is the mitotic phase of each cell?

Average annual precipitation and are the two major features that define the biomes on earth.

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

Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !