The function of sieve-tube elements is to
a. transport water upward
b. transport carbon dioxide into leaves
c. transport sugars throughout the plant
d. transport water downward submit

option c

Sieve tubes element are use to transport sugars through out the plants.

Explanation:

Sieve tubes element are elongated and specialised living cells found in the phloem of a flowetlring plant.

They help the phloem to function very well.

Their main function is to transport carbohydrates especially sucrose in the plants. E.g transporting of sucrose from leaves to the fruits.

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.