The correct response would be C. Zygote. Each of the gametes containing half of 50% of the genetic information and or chromosomal content from their respective parents will combine together to essentially produce a diploid chromosome number organism. An organism that would have both complete copies of DNA from each parental organism.
The hours of daylight and dark time depends on where you are but how many snails and plants it takes to keep a stable environment my guess would be a few thousand snails and a couple thousand plants and also they have to be different kind of plants of so they can benefit from each other all around.
The floor of an aquatic biome is called the "Benthic Zone".
The original sample was an compound, as an element would simply just not break down as it’s composed by itself.
