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
Murrr4er [49]
2 years ago
8

How are stromatolite fossils evidence of earths early life?

Biology
1 answer:
solmaris [256]2 years ago
4 0

Answer:

Early cyanobacteria in stromatolites are thought to be responsible for increasing the amount of oxygen in the primeval Earth's atmosphere through their continuing photosynthesis. They were the first known organisms to photosynthesize and produce free oxygen.

Hope this helps!!!

You might be interested in
Above 380C and below OoC the rate of photosynthesis decreases. Propose a hypothesis to explain why this occurs.
Effectus [21]

<u>Answer:</u>

<em>Enzyme activity decrease at these temperatures. </em>

<u>Explanation:</u>

Photosynthesis is facilitated by the action of various enzymes and involves light and dark reactions.  In <em>light reactions chlorophyll absorbs sunlight and creates ATP AND NADPH</em>. In dark reactions carbon is fixed using the <em>ATP and NADPH. </em>

The efficiency of all these activities depends on the activity of enzymes which depends on the temperature. The optimum temperature range where the enzyme activity is optimal is about <em>10°c - 20°c</em>. At low temperatures and high temperatures enzyme activity is less efficient.

<em>At a temperature above 38°c and below  0°c enzyme activity decreases. </em>

7 0
4 years ago
What are the conditions favouring AIR-BORNE disease?
LUCKY_DIMON [66]

Answer:

its like any other disease

Explanation:

was there more to the question?

8 0
3 years ago
Read 2 more answers
Saul's muscle cells are said to have built up an oxygen debt. What must he do in order to 'repay' this debt?
tatuchka [14]

Answer:

tell him build it then thats the answer your stu...pid

Explanation:

6 0
3 years ago
Why is it important that antibodies have a symmetrical quaternary structure? to enable binding to many different antigens to cre
Morgarella [4.7K]

<span>It is important that antibodies have a symmetrical quaternary structure to create two identical binding sites for antigens. An antibody is a relatively large protein having a Y-shape. Plasma cells produce antibodies which are then used by the immune system to fight off pathogens (e.g. bacteria and virus). The antibody is able to recognize the antigen of the pathogen. It binds with it either to neutralize it directly or “tag” the microbe for future attack by other parts of the immune system. </span>

3 0
3 years ago
What is the source of continuous heat and energy that we receive from the sun? Fill in the blank please
Lady bird [3.3K]

Answer:

Solar energy

Explanation:

5 0
3 years ago
Other questions:
  • These sunflowers seem to follow the path of the sun as it travels across the sky during the day. Plants bending toward or follow
    10·2 answers
  • Which best describes what happens to a developing fetus during the third trimester?
    14·2 answers
  • Poderia uma uva que você está comendo hoje tem a mesma maquiagem genética como uma uva alimentada a um antigo faraó egípcio? exp
    11·1 answer
  • What is true of the allele pair of someone with a genotype TT?
    13·2 answers
  • The freshwater Alga Spirogyra form long threadlike colonies called?
    6·1 answer
  • Will name Brainliest
    6·2 answers
  • 3)
    10·1 answer
  • Where is genetic information stored within cells? Genetic information is stored in the
    6·2 answers
  • List out any 3 adaptations observed in aquatic plants
    14·1 answer
  • Chegg 'how do the kidneys help retain glucose in the body? how is glucose reabsorbed by the kidneys?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!