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Amanda [17]
3 years ago
6

The atmosphere that we depend on for our survival is enriched by numerous cyanobacteria. This fact justifies which characteristi

c of cyanobacteria?
Cyanobacteria are photoautotrophs.
Cyanobacteria multiply quickly.
Cyanobacteria are plants.
Biology
2 answers:
Irina-Kira [14]3 years ago
8 0

Answer:

The correct answer is option A, Cyanobacteria are photoautotrophs

Explanation:

Being photosynthetic and aquatic, Blue green algaes are considered to be the Cyanobacteria and they belong to the category of  aerobic photoautotrophs. The common essentials required for their survival are water, carbon dioxide, inorganic substances and light. Photosynthesis is their principal mode of energy metabolism. They are considered as an important contributor of oxygen in the Earth’s atmosphere.

ira [324]3 years ago
7 0
Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

The answer is <span>Cyanobacteria are photoautotrophs.

</span><span>Cyanobacteria /saɪˌænoʊbækˈtɪəriə/, also known as Cyanophyta, is a phylum of bacteria that obtain their energy through photosynthesis. The name "cyanobacteria" comes from the color of the bacteria.</span>
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Question 7 0410
aev [14]

Answer:

Nuclear fusion

Explanation:

Nuclear fusion is a process whereby the nuclei of two smaller atoms combine to form a much larger atom, accompanied with the release of energy. This is opposed to nuclear fission where a larger atom splits into simpler and smaller atoms.

According to this question, the process of releasing energy when two stoms combine to form a larger atom is called NUCLEAR FUSION. A very common example of nuclear fusion is the combination of hydrogen atoms in the sun to produce Helium atom, with the release of heat energy.

3 0
3 years ago
Which of the following individuals is most likely to allow a recessive lethal gene to be kept in a population over several gener
Lynna [10]
 the answer is c. heterozygous
3 0
3 years ago
What are the two main ways a star can live based on it mass?
Andrej [43]

Answer:

Main sequence stars fuse hydrogen atoms to form helium atoms in their cores. About 90 percent of the stars in the universe, including the sun, are main sequence stars. These stars can range from about a tenth of the mass of the sun to up to 200 times as massive.

Stars start their lives as clouds of dust and gas. Gravity draws these clouds together. A small protostar forms, powered by the collapsing material. Protostars often form in densely packed clouds of gas and can be challenging to detect.

"Nature doesn't form stars in isolation," Mark Morris, of the University of California at Los Angeles (UCLS), said in a statement. "It forms them in clusters, out of natal clouds that collapse under their own gravity."

Smaller bodies — with less than 0.08 the sun's mass — cannot reach the stage of nuclear fusion at their core. Instead, they become brown dwarfs, stars that never ignite. But if the body has sufficient mass, the collapsing gas and dust burns hotter, eventually reaching temperatures sufficient to fuse hydrogen into helium. The star turns on and becomes a main sequence star, powered by hydrogen fusion. Fusion produces an outward pressure that balances with the inward pressure caused by gravity, stabilizing the star.

How long a main sequence star lives depends on how massive it is. A higher-mass star may have more material, but it burns through it faster due to higher core temperatures caused by greater gravitational forces. While the sun will spend about 10 billion years on the main sequence, a star 10 times as massive will stick around for only 20 million years. A red dwarf, which is half as massive as the sun, can last 80 to 100 billion years, which is far longer than the universe's age of 13.8 billion years. (This long lifetime is one reason red dwarfs are considered to be good sources for planets hosting life, because they are stable for such a long time.)

Explanation:

I hope this helped!

3 0
3 years ago
Read 2 more answers
11. A woman requires more calcium in her diet when she is pregnant.
Rainbow [258]
D because it’s healthy for the baby to eat protein
5 0
3 years ago
Read 2 more answers
The key to the evolution of altruism is that a. recipients have to be more likely to carry the altruistic allele than nonrecipie
cupoosta [38]

Answer:

The correct answer is b. actors have to be more likely to carry the altruistic allele than non actors.

Explanation:

Altruism is the behavior by an organism that benefits other organisms by costing its own fitness. The actor is the individual who is doing altruism and the recipient is the individual who is getting benefited by the actor's altruism.

An example of altruistic behavior can be seen in animal kingdom easily. Vampire bats give blood to those members of the community who were not able to go for search for blood show altruistic behavior.

Actors have altruistic genes that suggest them to behave altruistically. Non-actors may not contain alleles of altruism but the recipient might have altruistic alleles.

Hamilton's rule says that natural selection will favor the altruistic allele when rb > c.

where r = coefficient of relatedness between donor and recipient

          b = benefit received by recipient and

          c = cost paid by altruist.

Therefore, the correct answer is b.

6 0
3 years ago
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