The Late Pleistocene extinction event saw the extinction of many mammals weighing more than 40 kg. The proportional rate of megafauna extinctions is consecutively larger the greater the human migratory distance from Africa.
The effect that climate has on extinction is very big. The biodiverse Earth can't keep up with the rapid changes in temperature and climate. The species are not used to severe weather conditions and long seasons, or a changing chemical make-up of their surroundings.
As more species die, it is only making it more difficult for the survivors to find food. The warmer climates we are used to present-day are perfect for diseases and epidemics to thrive. Changes in Sea Levels or Currents The changes in sea levels and currents is a result, in part, of the melting freshwater.
The denser, saltier water sinks and forms the currents that marine life depends on. Ocean floor spreading and rising also affects sea level.
A small rise in the ocean floor can displace a lot of water onto land that is all ready occupied. The gases from the volcanic activity can also be absorbed by the water, thus changing the chemical composition, making it unsuitable for some life. The reverberations can be felt around the world.
The impact site is completey destroyed. Cosmic Radiation is radiation being emitted from outer space and the Sun.
It is hypothesized that being exposed to too much cosmic radiation can mutate genes, which can potentially weaken a species' genepool in the future.
Since the radiation comes from space and the Sun, it is extremely difficult to avoid the radiation. Supernova remnants is one source of cosmic radiation.
The chemicals get absorbed by water droplets in the clouds, and eventually fall to the earth as acid precipitation. Acid rain increases the acidity of the soil which affects plant life.
It can also disturb rivers and lakes to a possibly lethal level. With the changing climate and landscape certain species are losing their ability to fend off disease.
They are becoming more susceptible to disease and epidemics, which can lead to their eventual extinction. Spread of Invasive Species Invasive species invade foreign territory. They use resources that the other species depend on. Once competition gets too great, the survival of the fittest plan will begin, and one of the species, usually the natural one, will die off.
Natural factors usually occur at a slower rate than human factors and therefore cause a lower extinction rate. Human activities occur at a faster rate and cause higher extinction rates.
Human activities are mostly responsible for the present extinction rates.Problem: Extinction of Plant and Animal Species Massive extinctions have occurred five times during the earth's history, the last one was the extinction of the dinosaurs, 65 million years ago.
Scientists are calling what is occurring now, the sixth mass extinction. Among the main causes hypothesized by paleontologists are overkill by the widespread Species extirpated from significant portions of or all former ranges in Europe and Northern Eurasia during the Quaternary extinction event since these animals first appeared in North America less than , years ago and so were geographically removed.
The evidence for a Snowball Earth first emerged in the early s. this period of extreme cold cause life to switch gear so rapidly? information to decide whether animals created Snowball.
The evolution of Earth's first animals more than million years ago caused global warming, new research shows. Some million years ago, animal life evolved in the ocean and began.
The first mass extinction of animal life on Earth was previously blamed on a rise in the oxygen concentration in the oceans as a result of a cooler climate. But a new study shows the catastrophe was really caused by a massive decrease in oxygen.
Rabies — the word probably brings to mind an enraged animal frothing at the mouth. An encounter with an infected animal can result in a painful, life-threatening condition.