Barbra McClintock an American biologist who lived during the 20th cemetery created the first genetic map for corn. McClintock discovered that recombination occurred during the process of crossing over in métodos. McClintock research reveals that recombination occurs—

it will increase due to the time span

i'd say that the moon rock is about 2.2 billion years old.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.