Why does an increase in temperature result in an increase in reaction rate?a) an increase in temperature raises the activation energy which increases the reaction rate. b) an increase in temperature causes the molecules to increase in size which increases reaction rate. c) an increase in temperature decreases the concentration of reactants which increases reaction rate. d) an increase in temperature causes an increases the number of collisions which increases reaction rates.

I believe your answer is A, but im not sure.

D) An Increase in temperature causes increases the number of collisions, which increases reaction rates.

Explanation:

Particles can only interact when they collide, increasing a substance's temperature will increase the movement of particles, which in turn increases the chances of collisions between these particles. Increasing the collisions between molecules increases the reaction rates.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.