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
Anna11 [10]
3 years ago
14

Which fossils provide information as to the mode of formation of an oxygen-rich atmosphere by about 2 billion years ago? multipl

e choice dinosaurs stromatolites trilobi?
Biology
1 answer:
Dominik [7]3 years ago
3 0
The fossils that provide information on the formation of an oxygen-rich atmosphere are the stromatilites from the Precambrian era. These are layered and columnar fossils consisting mainly of cyanobacteria which were the original life form back then. These bacteria took in carbon dioxide and produced oxygen by photosynthesis as early as 2.5 billion years ago (the earth is about 4.5 billion yrs old).
You might be interested in
How does dispersal help different species? dispersal helps different species to increase their range of places, thereby helping
icang [17]

Dispersal helps different species to increase their range of places, thereby helping to increase their population size in different regions. Dispersal also helps to avoid crowding of diseases of a single location as species move to different locations.

<h3>What is dispersal?</h3>
  • Dispersal is the act of distributing things over a large area. It is when the individuals or seeds move from one site to their growing site.
  • Dispersal can be active (move by oneself) or passive (require dispersers).
  • Seed dispersal is the mechanism of transport of plant seeds to new sites for germination and the establishment of new individuals and colonies.
  • This depends upon the effectiveness of the seed dispersers.
  • Seed dispersal occurs by wind, water, animals, bats, explosions or gravity of the earth.
  • Dispersal of seeds is very important for the survival of plant species.
  • If the plants of same type grow too closely, they have to compete with each other for light, water and nutrients from the soil.
  • Seed dispersal allows plants to spread out from a wide area and avoid competing with one another for the same resources.

Learn more about dispersal here:

brainly.com/question/28039336

#SPJ4

4 0
1 year ago
1<br> What are the two major divisions of the nerous system
postnew [5]

Answer:100% SURE PLZZ GIVE BRAINLIEST!!!!!!111

The nervous system consists of two major parts: the central nervous system and the peripheral nervous system.

Explanation:

In vertebrates it consists of two main parts, the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS consists of the brain and spinal cord. The PNS consists mainly of nerves, which are enclosed bundles of the long fibers or axons, that connect the CNS to every other part of the body.

4 0
3 years ago
Difference between eukaryotic and prokaryotic cells​
Elanso [62]
Eukaryotic cells are cells that have a nucleus, while prokaryotic cells do not.
7 0
2 years ago
How do you know that matter is conserved during the process of cellular respiration?
kow [346]
C hope that helps have a great day :))))
8 0
3 years ago
Bacteria can make their own folic acid, which is required for nucleic acid synthesis, but humans cannot and instead have to inge
lidiya [134]

This drug inhibits the growth of bacterial cells but not human cells. This is an example of the selective toxicity of antibiotics.

Folic acid is an essential component for all cells to synthesize nucleic acids (DNA and RNA). Human cells do not synthesize folic acid and they take it through food. Bacterial cells are impermeable to folic acid and hence they need to synthesize their own folic acid.

Antibiotics target the metabolic pathway of folic acid synthesis in bacteria by inhibiting one of the enzymes in this pathway. These drugs are only toxic to bacteria but not to humans because humans do not have the folic acid synthesis pathway and hence they do not get affected by the action of the antibiotic. This is known as the selective toxicity of antibiotics.

These antibiotics are designed in a way to target the infecting agent (bacteria) while rendering minimal or no toxicity to the host (humans).

Know more about selective toxicity here :

brainly.com/question/13142849

#SPJ4

7 0
2 years ago
Other questions:
  • Why do producers make up more biomass than primary consumers
    12·1 answer
  • Which rna is blueprint for genetic code
    9·1 answer
  • What single-use container uses the least amount of resources from environment
    6·2 answers
  • the thesis statement names supporting points in the same order that they appear as the paragraphs in the body section.
    5·1 answer
  • Write the hardy-weinberg equation and list the conditions a population must meet to maintain the hardy weinberg equilibrium. exp
    7·2 answers
  • The controversy over the ivory-billed woodpecker has pitted those who want to build a massive irrigation project against environ
    5·1 answer
  • Indicate whether the given structure is located in the outer, middle, or inner ear. pharngotympanic tube helicotrema stapedius
    6·1 answer
  • 7) According to scientists, Argentinosaurus is the heaviest known dinosaur. It weighed 220,000 pounds. How much would 1500 Argen
    11·1 answer
  • 2. In 1988 several large forest fires occurred in
    11·1 answer
  • What helps speed up a chemical reaction?
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!