This question has a two part answer. The first part is that an asteroid hitting the earth and the second part is massive volcanoes erupting around the world.
A field habitat vegetated by grass and other non-woody plants (grasslands) is known as a meadow. They are of ecological benefit as they are open, sunny regions, which fascinate and support fauna and flora that could not survive in other conditions.
In the given case, when a fungus colonizes the meadow and destructs the majority of its vegetation, which comprises species of small shrubs and grasses, then this may result in the decline of herbivore species due to lack of vegetation on which they survive, which will eventually result in the reduction of carnivore species, as they feed on herbivores.
Answer:
The population of sage-grouse decreases with the passage of time because of humans.
Explanation:
In the past, long time ago the population of sage-grouse bird were in millions in the Western United States of America and Canada but gradually decrease occurs in population with the passage of time due to the change which occurs in the environment by humans. Destroying the natural habitat for making buildings and for energy development decrease the population of sage-grouse from 16 million to 500,000 during 100 years.
The modern theory of evolution is easiest illustrated by the tree of life. This is a metaphoric visual representation off all past and present species (as far as we know them).
The root or origin of the tree represents the origin of life on earth. This is still a debated subject, but for the tree of life, it is assumed that it was a single celld organism.
This single cell, over time, evolved into the species that now live on Earth. Each species has its place on the tree's branches, which illustrate the evolutionary relationships and evolution on all life on earth. The closer the species are on the branches, the closer related they are.
Thus, according to the theory of evolution, at some point in time a fruit fly and a fruit bat <em>did share a common ancestor</em>. However, due to the fact that fruit flies are insects and bats mammals, they are part of different phylum (insects - Euarthropoda and mammals - Chordata).
Both species are far apart on the tree of life and which makes their common ancestor to have existed a long, long time ago, well over 525 million years (when the first vertebrates evolved).
