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Alex Ar [27]
3 years ago
13

Free oxygen formed on earth after

Biology
1 answer:
harina [27]3 years ago
5 0

Answer: (1) photosynthesis occurred

Explanation: The photosynthesis process in cianobacteria changed the composition of earth's atmosphera, rising oxygen levels. This could be possible since photosynthesis used energy from the sun to produce energetic intermediaries to synthesize sugars, and as byproduct due to water photolisis, is oxygen.

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In a population in which homozygotes (AA and aa) mate preferentially with individuals of the same genotype, which frequency will
uranmaximum [27]

Answer:

It will remain constant...

Explanation:

In accordance with the Mendel's law of segregation, independent assortment as well as Hardy-Weinberg Theorem., no matter what type of cross within the homozygotic characteristics takes place, the frequency of dominant and recessive will remain constant over the whole population even if selective breeding strategy is applied.

For example, the ratio for a single trait of allele will remain 3:1 for a whole population of large numbers

4 0
3 years ago
Which statement best describes the process by which the millions of body cells that form a housefly can all contain the same gen
Brut [27]
DNA replication?
Mitosis?
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Does asthma affect anything else besides just your breathing?
IrinaVladis [17]

Answer:

The classic symptoms of asthma include wheezing, coughing, tightness in your chest, and feeling short of breath. But other conditions — like allergies, chronic obstructive pulmonary disease (COPD), sleep apnea, and post nasal drip — can trigger the same problems.

Explanation:

8 0
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Why do sociologists use scientific methods of study in their investigations
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Its has to be A that's just plain common sense
6 0
4 years ago
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Carrot slices placed in a 0.2 M salt solution for several hours become flaccid (limp). Carrot slices placed in fresh water for s
SpyIntel [72]
<h2>Carrot in 0.2M salt solution</h2>

Explanation:

  • Carrot cuts put in 0.2M salt answer for a few hours gets flabby (limp).
  • Carrot cuts set in freshwater for a few hours gets <em>turgid  (firm).</em> From this, we can conclude that such as.  
  1. Freshwater is hypertonic and the salt arrangement is hypotonic to the cells of the carrot cuts.
  2. <em>Freshwater and salt arrangement are both hypotonic</em> to the cells of the carrot cuts.  
  3. Freshwater is isotonic and the salt arrangement is hypertonic to the cells of the carrot cuts.  
  4. <em>Freshwater is hypotonic</em> and the salt arrangement is hypertonic to the cells of the carrot cuts.  
  5. Freshwater and the salt arrangement are <em>both hypertonic to the cells of the carrot cuts.</em>
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3 years ago
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