Land plants developed to get the sperm cells to the egg.

1.stomata
2.phloem
3.xylem
4.pollen tubes

The correct option is the 4. Pollen tube.

Explanation:

When the male gametophyte of seed plants germinates a tubular structure produced which is pollen tube. Pollen tube extension is an important stage in the plant cycle.

They act as duct or tube to move the male gametes from the pollen grain from the stigma in angiosperms to ovules at the end of the pistil or straight through ovule in some of the gymnosperms.

Thus, the correct option is 4. pollen tube

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.