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
Veronika [31]
3 years ago
12

How long did the earth exist before life appeared on it?

Biology
1 answer:
DIA [1.3K]3 years ago
8 0
Your answer is C: 2 billions years! Hope that helps!
You might be interested in
Buffalo and tick birds exhibit:
Lady bird [3.3K]

The answer is mutualism or letter a.  The tick birds ride on the buffalo’s back and eats the tick from its body.  This relieves the buffalo from the insects that suck on its blood.  The birds have  a food source while the buffalo has someone to eat away at the ticks.

7 0
3 years ago
Genetic information about traits is carried in _____.
Scilla [17]
Genetic information is found in DNA, which is found in the nucleus. it could also be chromosomes, however.
6 0
3 years ago
Read 2 more answers
Earths atmosphere is warmed by the greenhouse effect because heat radiation from earth surface is what by gases in the atmospher
Svetradugi [14.3K]
Green House Effect is the Technique in Botanical science that is use in the garden to capture more light and decreases that amount of light that bounces back to the atmosphere. The light will be trapped inside a glass cage and be use by the plants in their photosynthesis. So if the earths will be affected by this technique, the gases from the atmosphere are mostly the reason that the light that is passes through it will not be the same that bounces back to the outer space. In a clearer way of explaining, the heat is trapped inside the earths atmosphere and may cause global warming inside of it. 
6 0
3 years ago
hy are there different theories about the effects of global warming? a. There is no data to support global warming. b. Global cl
antoniya [11.8K]

It would be c. More co2 means more radiation from the sun.

5 0
3 years ago
Which is the class of cnidarian that is characterized by having a dominant medusa stage and four gastric pouches?
vladimir1956 [14]

Answer:scyphozoa

Explanation:cniderians are aquatic animals.they have radial symmetry, that is they can be divided into two halves through any plane.

Cniderians may have nematocyst,which are stinging cells.

They have two forms,which are polyp and Medusa .

There are four classes of cniderians;hydrozoa, scyphozoa,cubozoa and anthozoa.

Scyphozoa are predominantly medusa,which is umbrella shaped.they are jelly fishes.

They have four or eight oral arms.

They possess four gonads and four gastric pouches .an example is the Aurelia.

5 0
3 years ago
Other questions:
  • Class reptilia and class amphibia share many traits. Name these shared traits
    8·1 answer
  • Earthquake victims often are left without drinking water because
    8·1 answer
  • True or false: an area that needs very fine movements, like the fingers or eyes, will have larger motor units.
    15·1 answer
  • Which taxonomic group of land plants still in existence today was the dominant group of land plants when the angiosperms began t
    6·1 answer
  • What do ligaments hold together in a joint?
    11·1 answer
  • Consider the 4 foods in order of the percent by mass of proteins, from lowest to highest. From food to food, as the percent by m
    8·1 answer
  • Who was the first scientist to monitor the movement of the stars and moon?
    12·2 answers
  • Antennae development in ants is thought to be a trait controlled by maternal effect. In ants, zig-zag coils are dominant to curl
    8·1 answer
  • What is the albedo effect?<br><br> Do you think the earth is warming up?
    12·2 answers
  • The process of chemically digesting protein primarily begins in the stomach. The process continues through the gastrointestinal
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!