1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
maksim [4K]
3 years ago
13

One natural cause of extinction would be the massive __________ that occurred in the 1800s.

Biology
2 answers:
Aleks [24]3 years ago
6 0
Earth's history. In the worst one, 250 million years ago, 96 percent of marine species and 70 percent of land species died off. It took millions of years to recover.

NemiM [27]3 years ago
6 0

Answer: volcano

Explanation:

usatestprep multiple choice answer

You might be interested in
Vaccination is a process of injecting a dead or weakened form of a germ into the body. How does this help strengthen the immune
Verdich [7]

Answer:

Because you body is introduced to the virus, it is familiar to it and can build up an immunity to the weakened form so when the actual virus invades, your body know what to do.

Explanation:

8 0
3 years ago
Groundwater helps to replenish our freshwater lakes and rivers. In two or more complete sentences, describe a source of contamin
Viefleur [7K]

The agriculture is one of the biggest contaminators of the groundwater. The contamination happens through the usage of chemicals in the agriculture for protection of the plants, or to encourage their growth. Part of those chemicals mange to wash through the soil and reach the groundwater. The majority of the groundwater is connected with the lakes and the rivers, thus the chemicals reach those waters as well. This makes these waters unusable for the humans because they are becoming toxic. The end result would be much less freshwater for usage, be it fro drinking, or for housework, as it can cause serious damage and even death if used, so a shortage of water would be inevitable.

8 0
4 years ago
The four main types of carbon based molecules in organisms are carbohydrates, lipids, nucleus acids and
dexar [7]

Answer:

carbohydrates, lipids, nucleus acids and proteins

5 0
3 years ago
THERE ARE MULTIPLE ANSWERS Which of the following systems use the cardiovascular system for the transport of materials? excretor
Archy [21]
Respiratory system, excretory system, digestive system
3 0
3 years ago
Read 2 more answers
A good way to control portion sizes when you eat out is to
cupoosta [38]
<span>A good way to control portion sizes when you eat out is to split an entre with a friend or eat only half and take the other half home. You have to eat fewer calories.Other ideas to eat more veggies, make oatmeal more filling with diced apples, and use a whole-wheat pita in place of bread so you can stuff it with more veggies.</span>
6 0
4 years ago
Other questions:
  • Iaia is the notation used to describe one possible genotype. how many blood type genotypes are possible?
    12·1 answer
  • Dr. flint, a health psychologist, would offer which reason that explains how optimism allows a person to maintain psychological
    13·1 answer
  • What is the scale length in centimeters from the beginning of the time period to the present on your scaled down geologic time s
    11·1 answer
  • Which best explains the evolution of gymnosperm plants?
    5·1 answer
  • Can proteins be used as a fuel to make energy for the body
    5·1 answer
  • Assume that you live in a city in the southern hemisphere. match each event with its approximate date. tiles spring equinox summ
    5·2 answers
  • Explanation on Mitosis​
    8·1 answer
  • M protein is produced by
    8·1 answer
  • NEED HELP ASAP PLS THANK YOU
    13·1 answer
  • What is the genotype for red hair?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!