How many hours minimum of sunshine to grow healthy vegetables

Biology

1 answer:

Alex_Xolod [135]3 years ago

5 0

It depends on the plant/vegetables.
8-12 hours of sunlight a day would be about average.

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List the structures that make up the pathway of air through the respiratory startin with the external nares

nekit [7.7K]

The Pathway
• air enters the nostrils
•passes through the nasopharynx
•the oral pharynx
•through the glottis
• into the trachea
• into the right and left bronchi, with branches and rebranches into
• bronchioles each of which terminates in a cluster
• alveoli

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4 years ago

Why will a radioactive rock never become completely stable?

Furkat [3]

Technically speaking, depending on the sample, the rock could become “stable.”

The radioactive decay of a radioisotope is expressed as a half-life equation; half-life is the colloquial term that describes how long it will take for half of the radioisotope to decay into another isotope or element. For example (if I remember correctly), Carbon-14 has a half life of 5,780 years. This means that in a 100% sample of C-14, after 5780 years passes, only 50% of that isotope would remain; another 5780 years, and only 25% would remain (half of half). Based on this principle, it seems like a sample could never fully decay because there’s always an amount that smaller than the current amount.

However, if the sample has a very short half life (milliseconds or nanoseconds) the sample would reach nigh-full decay eventually. At this point, it is considered “stable.”

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3 years ago

Which resource is a flammable gas that occurs naturally underground

AlekseyPX

Answer:

Natural gas is a mixture of gases – mostly methane. Natural gas is sometimes just called gas. Natural gas is found underground with petroleum. Natural gas is flammable (burns with a flame)

Explanation:

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3 years ago

How does nail growth work?

e-lub [12.9K]

Basically, there is a root. This root makes cells. Those cells die and multiply making your nail longer.

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3 years ago

If you have a pet cockroach with a brown body, how could you find out if it is

aleksklad [387]

Answer:

by testcrossing with a homozygous recessive partner

Explanation:

If a pet cockroach exists whose zygosity is unknown, this can be determined by a test cross. A test cross involves crossing an organisms whose zygosity is unknown with a partner that is homozygous recessive for the same trait.

Let us assume that brown body is represented by the allele B, the dominant allele. The homozygous recessive version would be bb.

The genotype of a brown cockroach whose zygosity is not known can be denoted as B_, where '_' can be a 'B' or a 'b'.

When B_ is crossed with bb:

B_ x bb

Progeny

2 Bb

2 _b

The phenotype of Bb would be brown (since B is dominant over b) while the phenotype of _b would depend on the zygosity level of the cockroach.

If the unknown genotype is BB, then _b becomes Bb and the phenotype will be a brown body. This means that all the progeny will appear brown. (see the first attached image for the Punnet's square)

In other word, if the unknown genotype is bb, then _b becomes bb and the phenotype will be a alternate color (non-brown) body. This means that 50% of the progeny will appear brown while the remaining 50% will be in the alternate color. (attached

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3 years ago