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Mashcka [7]
3 years ago
10

The four essential elements for life are

Biology
2 answers:
sertanlavr [38]3 years ago
7 0
The answer is a
Hope this helped

g100num [7]3 years ago
3 0
<span>
A. carbon, hydrogen, oxygen and nitrogen
These four elements make up almost 96% of the human body.

Hope this helps!</span>
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What atmospheric condition caused London's "killer smog of 1952 and regularly causes smog
wariber [46]

Answer:

London smog results from a high concentration of sulfur oxides in the air and is caused by the use of sulfur-bearing fossil fuels, particularly coal. This type of smog is aggravated by dampness and a high concentration of delayed particulate matter in the air.

Explanation:

So, the answer would be B or D.

But, it is most likely B due to dampness.

4 0
3 years ago
1. Explain how the traits of an organism are related to the genes in DNA.
viktelen [127]

Genes in DNA or responsible for the traits an organism has. This is caused by Dominant and Recessive Traits. Remember that Genotypes are the genetic letters such as RR, Rr, and rr. Phenotype is physical traits.

Dominant Traits are more likely or always show in the offspring. The Dominant Genotype uses Capital letters such as RR.

Recessive Traits are less likely to show up. Their Genotype use lower case such as rr. Now genotypes of Rr have one dominant trait and one recessive trait. If the dominant trait was black fur and the recessive white fur, the offspring will be black fur because dominant traits overpower the other.

To understand how to know if an organism will have Dominant or Recessive Genes, you have to use something called a Punnet Square. Lets imagine 2 parents both have the genotype Rr. R is Black fur and r is white fur. As you can see from the chart, 3 of 4 boxes have Rr and 1 rr. Since there is a Dominant Trait with a Recessive, they will show a Dominant Phenotype, or Black fur. This has 3/4 chance and a 1/4 chance for white fur in the offspring.

| R. r

-----------------------------------

R | Rr. Rr

-----------------------------------

r | Rr. rr

7 0
3 years ago
You are studying a pair of genes (A and B) that either gene alone can cause deafness. Deafness from Gene A is dominant. Deafness
Veseljchak [2.6K]

Answer:

BbxBb.

Explanation:

If Bb gene is crossed with Bb, the offspring is produced with normal hearing because both the genes are recessive in which the deafness gene hide and the hearing gene is dominant so the offspring can hear sounds clearly. The dominant A gene is responsible for deafness and we can see the offspring BbxBb in which no dominant gene is present. The other three offspring are deaf because of the presence of dominant A gene in their genetic makeup.

3 0
3 years ago
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Which macromolecule is the main source of energy for living things?
Solnce55 [7]
<span>carbohydrates ...................</span>
5 0
3 years ago
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Lol Help Me Again please
marta [7]
The last option is corrrect because when one species move away from an environment or die it lead to decrease in biodiversity as well as the overall health of ecosystem also decreases.
7 0
3 years ago
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