Records indicate the first gymnosperms likely originated in the Paleozoic era, middle Devonian period about 390 millions years ago.
D. Radio waves.
X-rays and visible light are transverse waves.
Shockwaves can be either longitudinal or transverse, hence radio waves is the most accurate answer.
Answer: Leaves are green because they have a green pigment called chlorophyll. They have small pores called stomata. Carbon dioxide (CO2) is absorbed into these leaves through the stomata. And sunlight gives energy to the plant to convert water and CO2 into sugar and starch, which is the food of the plant.
<span>The cells
from the male and female that combine to form a zygote are called gametes. The main
job of the gametophyte is gamete production. Gametes are haploid reproductive
cells. Gametes are produced in the sex organs on the haploid gametophyte by
mitosis or cellular division without reduction of chromosomes sets. There are
two sex organs; <u>archegonium</u> which is found in the female sex organ
producing egg cell and <u>antheridium</u> which is found in the male sex organ
producing sperm cells.</span>