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Marizza181 [45]
3 years ago
15

Your friend brings you rocks with a thick layer of oxidation weathering, and no other visible signs of weathering. this is a clu

e that the rocks were in what type of environment? a moist environment because there is a greater density of oxygen in the atmosphere in the presence of water. a moist environment because phyiscal weathring processes such as oxidation take place most quickly in the presence of water a dry environment because the increased albedo of deserts encourages physical weathering processes such as oxidation. a dry environment because in the absence of water oxidation is the dominant weathering process
Biology
1 answer:
Vsevolod [243]3 years ago
6 0
<span>A moist environment because physical weathering processes such as oxidation take place most quickly in the presence of water. There are three types of weathering, physical, chemical, and biological. For the physical weathering, there are two main types. Freeze-thaw cycles and exfoliation. Obviously the freeze-thaw cycles require water and the exfoliation generally happens through thermal expansion and contraction which doesn't require water. But since neither of these mechanisms were observed, that doesn't indicate if the area was wet or dry. Biological weathering is caused by plants or animals breaking down rocks via chemical (acid) or mechanical (root growth) means. Life generally indicates the presence of water, but since this form of weathering wasn't observed, we still don't have enough data. Chemical weathering is caused by rain water reacting with the rocks to form new minerals and salts. There are several types such as acidic rainwater dissolving part of the rock, and oxidation. With this in mind, let's take a look at the available options. A moist environment because there is a greater density of oxygen in the atmosphere in the presence of water. * Yes, we need a moist environment, but the density of oxygen is fairly constant world wide regardless of how moist or dry the environment is. So this is a bad choice. A moist environment because physical weathering processes such as oxidation take place most quickly in the presence of water. * Water speeds up chemical weathering of all types. So this is the correct choice. A dry environment because the increased albedo of deserts encourages physical weathering processes such as oxidation. * Yes, the increased albedo of deserts does speed up spalling, but oxidation is a CHEMICAL weathering process, not a PHYSICAL one. So this is a bad choice. A dry environment because in the absence of water oxidation is the dominant weathering process. * Water speeds up oxidation quite a bit. And since the observed oxidation is thick, there's been quite a bit of weathering. So this is a bad choice.</span>
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Answer: C)

Explanation:

I am 100% sure, however,

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It causes global warming due to emission of carbondioxide gas.

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4 0
2 years ago
Suppose that a gene for coat color in mice has two alleles, B and b, where B is completely dominant and encodes a black coat col
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Answer:

Genotype= Bb

Phenotype= Black coat

Explanation:

A single gene coding for coat color in mice is involved here. An allele is a contrasting or variant form of a gene. Most genes possess two alleles.

According to Mendel's findings in his law of dominance, an allele is capable of masking the expression of another gene. The allele masking or being expressed is called a DOMINANT allele while the allele being masked is called a RECESSIVE allele.

The alleles of a particular gene can either be in a homozygous or heterozygous state. The alleles are homozygous when they are the same in that gene while it is heterozygous when they contain two different alleles i.e. a combination of the dominant and recessive allele.

In this case of a gene coding for coat color in mice, The allele coding for Black coat (B) is dominant over that coding for brown coat (b). This means that in an heterozygous state, allele B will mask the expression of allele b.

The genotype of an organism is the actual genetic make-up of that organism while its phenotype is just its phyaically expressed trait.

Since a heterozygous organism has a combination of two different alleles, hence, the mouse in an heterozygous state for coat color will have a Bb genotype.

Also, since the allele for black coat coloration (B) is dominant over the brown coat coloration (b), thus, in a heterozygous state, the black colour allele will mask the expression of the brown color allele, and express itself (exercise its dominance).

Therefore, a Bb genotypic mouse will produce a black coat phenotype.

N.B: A recessive trait can only be expressed when the organism is homozygous recessive for a particular gene i.e. have the same recessive genes but a dominant phenotype can have a homozygous or heterozygous genotype.

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