I believe it is B you will want to make sure using an outside source though. It is definitely not C,D, or E
Answer:
The atmosphere is a protective layer of gasses that shelters all life on Earth, keeping temperatures within a relatively small range.
Explanation:
Answer:
Without fertilizers, nature struggles to replenish the nutrients in the soil. When crops are harvested, important nutrients are removed from the soil, because they follow the crop and end up at the dinner table. If the soil is not replenished with nutrients through fertilizing, crop yields will deteriorate over time.
Explanation:
this is not mine fyi
To form metamorphic rocks, rocks do not melt but they are still heated up and their mineral structures change.
"Morph" means to change
Answer:
B. pre-zygotic, lock and key
Explanation:
When pollens from the different species fall on the stigma of a flower from some other species, the chemicals released from the stigma do not allow the pollens to germinate. The pollen tube is not formed to carry the male gametes to the egg cell for fertilization. Since this process does not allow the formation of zygote between the male and female gamete of two different species, it is a pre-zygotic isolating mechanism.
Here, the pollens and stigma of different plant species are not compatible with each other and the structural incompatibility of the reproductive structures prevents fertilization. This represents the lock and key mechanism of reproductive isolation.
