A student measured the time taken for a reaction to finish at a range of different temperatures. He also measured the pH of his solutions to see if they varied. At 10°C the reaction took 1 minute 35 seconds. At 15°C it took 65 seconds, at 20°C 42 seconds, and at 25°C half a minute. The pH was exactly 7 for the 10°C result, 7.2 for the next, 7.1 for the third and 7.4 for the last (pH has no units). Record these results in a suitable table.

Maria wanted to grow a fern in her backyard. acting on a suggestion from a friend, she collected brown dots from the underside of a fern's leaves and then potted them. after a few days, maria saw small fern leaves erupting from the pot. which statement explains this phenomenon? a. the fern transitioned from gametophyte generation to sporophyte generation. b. the fern grew as a result of mitosis. c. the fern transitioned from sporophyte generation to gametophyte generation. d. the fern grew to be genetically identical to its parent plant.

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

What are the fixed alleles in the human species? o a. the alleles that are on the most chromosomes b. the alleles that change most often 000 c. the alleles that no one has d. the alleles that everyone has