<h3>ANSWER:</h3>
In case of plants there is a process called PHOTOSYNTHESIS occurs. A photosynthesis is a process in which the carbon and water involves and as a result oxygen plus glucose forms. And because of that plants cause the atmospheric Carbon dioxide decreases as they use the carbon dioxide in the atmosphere.
The atmospheric conditions at a particular time
It is called a watershed.
B. because it is dependent on something to manipulate (change) it, that is why it is called a dependent variable :)
<span>Only one sperm normally fuses
with an egg because if more than one sperm fuses, through a process
called polyspermy, development of the zygote usually stops.
</span>
<span>Fertilization of one egg by
two sperm is possible, but the resulting zygote is almost never viable
because such a zygote would have three sets of chromosomes instead of
the normal two. This condition, called triploidy, is usually
incompatible with life. Those rare triploid infants that do survive to
term have severe and multiple birth defects and rarely live more than a
few days. </span>
