Question

how would the introduction of a competitor to a bird species affect the distribution of a species if they had overlapping niches? * 1 point
both species will go locally extinct.
both species will migrate from the area.
the realized niche will become smaller due to competition.
the realized niche will increase due to greater biodiversity.
which statement explains why there have been five mass extinctions over the past 500 million years? * 1 point
environmental changes on a global scale changed at a faster pace than species could adapt.
environmental changes caused reduced land mass, leaving significantly less habitat for land plants and animals.
new species quickly proliferated to outcompete the existing species on earth during those periods.
asteroid impacts and volcanic eruptions removed the trees that provided shade and vegetation for land animals.

Explanation:

For the first question, when two species have overlapping niches and a competitor is introduced, competition for resources occurs. This leads to a reduction in the realized niche of each species. For the second question, mass extinctions over the past 500 million years have been mainly due to rapid - paced global environmental changes that species couldn't adapt to quickly enough.

Answer:

1. C. The realized niche will become smaller due to competition.
2. A. Environmental changes on a global scale changed at a faster pace than species could adapt.