Why do some organisms become extinct?

Why do some organisms become extinct?

Species may become extinct because of changes in climate (i.e. the ice age), competition with other species, a reduced food supply, or combinations of all of these. Most natural extinctions are isolated events that happen over a fairly long period of time.

What is the greatest cause of organisms becoming endangered and eventually going extinct?

Loss of Habitat One of the most significant causes of endangered animals is habitat loss. While habitat may be lost due to natural forces (climate shifts, geologic changes), much of the habitat lost today is due to human activity.

Why do some animals become endangered Class 8?

The species which no longer exist anywhere on the earth are called extinct species. An animal species become endangered either because it is few in number or it is being killed by predators or it is being hunted by human beings or its natural habitat is destroyed by deforestation.

What are extinct examples?

Top 10 Extinct Animals

1. Sabre-toothed Cat. Often called Sabre-toothed Tigers or Sabre-toothed Lions, they existed 55 million to 11,700 years ago.
2. Woolly Mammoth. An enormous mammal, believed to be closely related to the modern-day elephant.
3. Dodo.
4. Great Auk.
5. Stellers Sea Cow.
6. Tasmanian Tiger.
7. Passenger Pigeon.
8. Pyrenean Ibex.

Has a species gone extinct from a virus?

Unfortunately, some viruses are unlikely to ever go extinct, because we aren’t their only host. In humans, outbreaks of Ebola end all the time. There have been at least 26 across Africa since the virus was discovered in 1976, and these are just the ones that caused enough cases to be picked up by health authorities.

What is the deadliest infectious disease?

Beware of the World’s Most Deadly Infectious Disease: Tuberculosis. It’s going to kill 4 million people this year, according to the World Health Organization (WHO). In 2018, 10 million people fell ill with it and 1.5 million died.

What are the 5 most common infectious diseases?

The 5 Most Common Infectious Diseases

• Hepatitis B. According to current statistics, hepatitis B is the most common infectious disease in the world, affecting some 2 billion people — that’s more than one-quarter of the world’s population.
• Malaria.
• Hepatitis C.
• Dengue.
• Tuberculosis.