Below is a graph showing the change in temperature and relative rate of enzyme action. Which factor most likely accounts for the change in the rate of enzyme action as the temperature increases from 40c to 58c

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

If 360 joules of work are needed to move and create a distance of 4 m what is the weight of the crate

Brass gets discoloured in air because of the presence of which of the following gases in air? a. oxygen b. hydrogen sulphide c. carbon dioxide d. nitrogen