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.
Causes fishermen to lose at least 165 million pound of fish a uear today and 717.1 million pound of potential future catch. Desalted water also puts drinking water supplies at risk because sea water contains chemicals such a boron, taht freshwater does not.
Answer:
The science that involves using living organisms to produce needed materials.
Explanation:
I got this question correct!
The part of the Human body that is most similar in function to the spongy mesophyll layer in a leaf is A) Alveoli in the lungs.
I do not agree, only because there have been so many children to play with toys like that, and they have been perfectly fine, so its like a one out of million chance.
