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Verizon [17]
3 years ago
11

In which supereon did single-celled organisms first form on Earth?

Biology
2 answers:
zalisa [80]3 years ago
8 0
The answer is D. Precambrian.
Archy [21]3 years ago
8 0
Precambrian Should be the answer
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In an individual of genotype aa, where are the a and a alleles physically located?.
9966 [12]

Genotypes are the genetic composition of the organism. The alleles for the genotype are located at the genetic loci of the chromosome inherited from each parent.

<h3>What are alleles and genetic loci?</h3>

The alternate version of the genes that code for the hereditary trait and characteristic of the organism giving them the genotype and the phenotype is the alleles.

Genetic loci is the designated position found on the chromosome of the organism possessing the alleles coding for the genotype that can be purebred dominant and recessive, and heterozygous.

Therefore, alleles are physically present on the loci.

Learn more about loci here:

brainly.com/question/15835423

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8 0
2 years ago
Read 2 more answers
After a recent experiment, a
bija089 [108]
Here's what he must do:

-- Run the experiment again, several times if possible.  Combine or analyze
the results of the several experimental runs in some statistically valid way.

-- Run the simulation again, several times.  Combine or analyze the results
of the several simulations in some statistically valid way.

-- Then, compare the analysis of several experimental runs with the analysis
of several simulations, in some statistically valid way, to decide whether they
<em>really</em> don't track.

-- If they do, then look for ways to tighten up the simulation so that maybe
they can track better.

-- If they don't, then he's back to <em>before</em> Square-1.  He not only has to
deal with the question of whether or not his experiment is valid, but he
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5 0
4 years ago
What characteristic of most of the tropical open oceans is directly responsible for the low chlorophyll levels in these waters?
FrozenT [24]
<span>One characteristic of most of the tropical open oceans that  is directly responsible for the low chlorophyll levels in these waters is </span>Low nutrient concentrations.  
3 0
4 years ago
3. Three redwood trees are kept at different humidity levels inside a greenhouse for 12 weeks.
Over [174]

Answer:

This question is asking to identify the following:

Independent variable: Different humidity levels

Dependent variable: Height of the plant

Control group: Tree left outside in normal conditions

Controlled variable: same time of measurements (once in a week), same types of trees

Explanation:

Independent variable is the variable that the experimenter changes or manipulates in an experiment. In this experiment, three redwood trees are kept at different humidity levels. Hence, the independent variable is the DIFFERENT HUMIDITY LEVELS the redwood trees were kept at.

Dependent variable is the variable that is measured in an experiment. It is the variable that responds to the changes made to the independent variable. In this case, the HEIGHTS of the trees measured is the dependent variable.

Controlled variable or constants are those variables that must be kept unchanged throughout the experiment for all groups. In this experiment, the constants are: same time of measurements (once in a week), same types of trees (redwood).

Control group is the the group in an experiment that does not receive experimental treatment. In this case, the group that does not receive treatment/control group is: Tree left outside in normal conditions.

7 0
3 years ago
When a car suddenly stops, the objects in the back seat are thrown forward. This is due to—
viktelen [127]
The answer would be The law of interia That should be The right answer
6 0
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