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
bearhunter [10]
3 years ago
5

Select the correct statement about current hypotheses for the cause of the Cambrian explosion.

Biology
1 answer:
Pachacha [2.7K]3 years ago
6 0

Answer:

A. Oxygen levels reached a critical threshold at the start of the Cambrian explosion, making the evolution of big, mobile animals possible.

Explanation:

The Cambrian explosion was an event that happened approximately 541 million years ago and it lasted for about 13 – 25 million years.

The current hypothesis for the cause of the Cambrian explosion is that oxygen levels reached a critical threshold at the start of the Cambrian explosion, making the evolution of big, mobile animals possible.

Option A. is correct.

You might be interested in
Help please !!!!! It’s a test
astra-53 [7]

Answer:

A question is never clear

5 0
3 years ago
Which of the following statements is correct with respect to the photosynthetic pathway of grass or a cactus?
Gnesinka [82]
In a cactus, carbon is fixed only during the day. this is because cacti need sunlight to perform photosynthesis. Have a great day :)
5 0
3 years ago
Natural killer cells destroy target cells or pathogens by ingestion and destruction of particulate matter in a process called ph
podryga [215]

Answer:

<h2>False</h2>

Explanation:

Natural killer cells (NK cells) are a type of lymphocyte and also a component of innate immune system. NK cells play various functions in immune system and they play a major role in the host-rejection in virally infected cells.

NK cells are activated in response to interferons  and also by various other responses. NK cells work to by secreting IFNγ and TNFα. Natural killer cells play a very important role in early host defense against viruses.

4 0
3 years ago
.
ollegr [7]
I think the correct answer from the choices listed above is option A. <span>The type of soluble fiber found in oats, barley, lentils, split peas, and beans protects against heart disease. Hope this answers the question. Have a nice day.</span>
4 0
3 years ago
Read 2 more answers
The contracting and relaxing of the heart is known as the?
kipiarov [429]

Answer:

Cardiac Cycle

Explanation:

Contracting= Systolic

Relaxing=Diastolic

5 0
3 years ago
Other questions:
  • Which of the following are not characteristics of the plasma membrane?
    10·1 answer
  • The __________ of the organic molecule controls the chemistry of life
    13·2 answers
  • The kidneys remove which cellular waste product from blood?
    9·2 answers
  • Which term describes one kind of movement of Earth? A.)eclipse B.)revolution C.)tilted orbit D.) lunar cycle
    11·1 answer
  • If you all need help in science let me know
    14·2 answers
  • What is extracellular matrix ? in simple words pls​
    12·1 answer
  • Where can the process of lactic-acid fermentation be found
    10·1 answer
  • Help me pleaseyyyyyy
    12·1 answer
  • 10. What is principal?
    11·2 answers
  • What is probability, and how is it used with Punnett squares to predict the outcomes of genetic crosses?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!