Which statement best explains how sexual reproduction increases variation within a species? A: it causes the genes of two different individuals to mix
B: it changes the base sequence of an organism's DNA
C: it copies one parents genes to make each offspring
D:it changes the trait that a given gene produces

Explain how you might determine the rate of weathering on a sample rock

Which statements about the two fossil images are correct? 1. cave bears are ancestors of plateosaurus. 2. plateosaurus were present on earth before ostracoderms. 3. ostracoderms were the first to die. 4. plateosaurus died after the ostracoderms. 5. cave bears are the oldest fossils.

Anna’s mother prepares sauerkraut, a fermented dish made from finely cut cabbage and salt. lactobacillus bacteria present on the surface of the cabbage combine with salt to turn the cabbage into a crunchy, sour dish. what chemical process occurs to create this dish? a. alcoholic fermentation b. cellular respiration c. conservation d. lactic acid fermentation e. photosynthesis