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Artemon [7]
3 years ago
11

Oxygen was initially created in Earth's atmosphere by _____. volcanoes outgassing cyanobacteria photosynthesizing greenhouse eff

ect Ozone breaking down
Biology
2 answers:
VikaD [51]3 years ago
7 0

The answer might be Cyanobacteria photosynthesizing

SCORPION-xisa [38]3 years ago
6 0

The correct answer is B. Cyanobacteria photosynthesizing

Explanation:

Oxygen is a chemical element necessary for most life forms to exist, this includes most animals as they require oxygen for multiple body functions. This element is nowadays one of the most abundant elements in the atmosphere and due to this, life forms are abundant and diverse; however, before photosynthetic organisms oxygen was not part of the Earth's atmosphere. This can be explained as organisms that rely on photosynthesis, use carbon dioxide, water, and sunlight and release oxygen into the atmosphere. Due to this, it is believed oxygen in the atmosphere was the result of cyanobacteria and other primitive organisms that carried out photosynthesis.

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Phytoplankton serves as food for virtually all the organisms living in an aquatic environment. It is a primary food producer and serves as the foundation of aquatic food web. If there is a decline in the amount of phytoplankton, the organisms which feed directly on the plant may reduce significantly as a result of dire competition for food, this in turn will affect the organisms which feed on the dying out organisms and the trend will move in a similar way until it affect all the organisms living in that particular aquatic habitat. 
5 0
3 years ago
Most mammals have diploid body cells and haploid gametes. During __________, chromosomes from haploid gametes combine, and a ___
spin [16.1K]

Answer: B). fertilization, diploid

Explanation: During fertilization, the sperm cell (a gamete) fuses with an ovum or egg (a gamete) to form a zygote. Each of the gametes have haploid number of chromosomes (23 chromosomes) and they fuse to produce a zygote with a diploid number (46 i.e., 23 pairs) of chromosomes.

4 0
3 years ago
Help me please with explanation ​
Usimov [2.4K]

Answer:

E: provide a meeting site for mRNA and tRNA

6 0
2 years ago
A general mechanism by which postsynaptic potentials are terminated involves Group of answer choices increased synthesis of the
jolli1 [7]

Answer:

The correct answer is - reuptake of the neurotransmitter molecule into the axon through a membrane transporter.

Explanation:

The action of a neurotransmitter at the postsynaptic cell or postsynaptic potentials is terminated by any of these mechanisms that are enzymatic degradation, diffusion or reuptake into the presynaptic cell by specific transporters.

After the desired biological response by postsynaptic potentials, in order to avoid over stimulation or termination of the postsynaptic potentials the neurotransmitter is taken back into the axon through a membrane transporter. This mechanism is to maintain a balance.

5 0
3 years ago
All fungi are : <br><br> eukaryotic<br> prokaryotic <br> unicelular<br> multicelular
kirill [66]
All except prokaryotic
4 0
3 years ago
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