<span>The correct option is A. Dark age are so called because compare to other eras, historian don't know much about this era. This period of time is considered lost to history, no important record about the era has survived, The cause of the dark ages was the collapse of the Roman Empire and the invasions and raiding that characterized it.</span><span />
Answer:
An individual organism that supplies living tissue to be used in another body, as a person who furnished blood for transfusion or an organ for transplantation in a histocompatible recipient that doesnt function.
Explanation:
Answer:
Ovule is the organ responsible for the formation and containment of reproductive cells and it consist of majorly three parts which are integuments (the outer part), the nucellus and the gametophyte
Sepal acts majorly as a defender providing protection to the reproductive cells also acting as a petal in plants without petals.
Answer:
I think that the answers are A and D.
For option A, we can come to the conclusion by thinking about the effects of invasive species. For example, when an invasive species appears in a specific environment and unfortunately feed on the same kind of plant as the native species, it will lead to the fact that they have to compete more in order to survive.
For option B, we can clearly see that it's wrong. From the point above, we can also predict that there is a high chance the invasive species will win the competition, resulting in the decrease population of the native specices that couldn't compete.
For option C, it is also impossible, instead the opposite is more likely to happen, because as we know, the native species, after a long period of evolution, became almost perfectly adapted to the environment, the appearance of invasive species may help the diseases that the native species weren't immune to spread faster, decreasing the population.
And I guess option D is obviously correct, no need to explain.
