Viruses aren’t normally considered organisms
Answer:
a. two plant species flowering at different times.
Explanation:
<em>The only option that is not a post-zygotic reproductive isolation mechanism would be option a, when two plant species flower at different times.</em>
Post-zygotic reproductive isolation mechanisms are those mechanisms that act to ensure that the product of fertilization remains invalid. This is as opposed to pre-zygotic isolation mechanisms that act to prevent fertilization and hence, formation of zygotes.
In option b, c, d and e; the zygote has been formed already and all the forces are just acting to ensure that it remains invalid. whereas in option a, there is no fertilization yet.
<u>Two plant species flowering at different times will ensure that there is no cross pollination between the two species. Without pollination, there cannot be a zygote formation.</u>
Hence, the correct option is a.
Mutation can be both beneficial and harmful.
A very common beneficial mutation is camouflage and natural selection. The organism will acquire the change and pass it on to their offspring.
A harmful mutation can be diseases or a common harmful mutation, Down syndrome. Which gives a person an extra chromosome.
Answer:
Based on the diagram, tropical cyclones are powered by cold, high altitude air.
The human activities in addition to natural factors that can alter the terrestrial ecosystem is deforestation.
<h3>The effects of deforestation on food web</h3>
Deforestation is a the clearing of trees in a large area of land which can be purposeful or by nature.
Human activities that leads to clearing of trees include the following:
- dam construction and infrastructure development.
One of the negative effects of deforestation on food web is the reduction in food availablity. This is so because of the loss of biodiversity that are source of food to man.
The human activities in addition to natural factors that can alter the terrestrial ecosystem is deforestation.
Learn more about deforestation here:
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