One of the three main functions of stems is to
a. carry out photosynthesis.
b. carry water and nutrients between roots and leaves.
c. store carbohydrates.
d. store water.

Complete the statements to identify the first two steps of meiosis i. (1 ) the first and longest step of meiosis i is called i. (2)the second step of meiosis i is called i.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca