Answer: C - introduction of an unchecked invasive species.
E- massive flooding.
Explanation:
The catastrophic event can be define as the event which can cause huge damage to the living and non-living factors of the ecosystem. It can make the environment unsuitable for the survival of the living beings and can become the cause of mass extinction.
C is the correct option because the introduction of invasive species can reduce the population of members of the native species if the invasive species compete with the native species for resources.
E is the correct option because the massive flood will wiped out the living beings and can destroy the landscape and property of the region where it occurs.
This is because the sieve plate interconnected like that help in exchange of substances or transport of substances between element cell and it act as a barrier to prevent the sap from been loss when phloem is damaged or cut. The sieve plates form the sieve tube which is the conducting element of the phloem. It is formed from series of elongated cells that are interconnected by perforations in their walls.
Some of the core reasons are: 1) Deforestation 2) Excessive use of fossil fuels 3) Unevenness of Garbage 4) Increasing Population 5) Expansion of Urban area
