Answer:
Not eating enough food, because cells need molecules from both food and air to work.
What are you even asksing?
Natural selection states that under naturally occurring circumstances, certain organisms may not survive. In other words, the weakest link is the one who doesn't make it.
Answer:
Soil erotion is like a sloping of land that causes land slides because there are no trees or grasses there to hold the soil together.
<span>The current estimated total number of species on earth is between five million and hundred million.
The reason why it is hard to get an accurate count is because some species are very hard to find reason being that of nocturnal habits, location, and the size.
All the species which have ever lived on earth are being estimated to be extinct. It is approximately one extinction for every million species for years. Mammals species like typically persist for one million years.</span>
