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sp2606 [1]
3 years ago
9

Bottom-oriented fish have large, broad pectoral fins and depressed( flattened top-to-bottom) body shapes. Explain how these adap

tations are well suited for life at the bottom of a body of water.
Biology
1 answer:
Fittoniya [83]3 years ago
3 0

Answer:

they are better for camoflauge and for deep pressure

Explanation:

the fins helps control the crushing pressure that is constant at deep depths and the flattened bodies make them less visible since it is dark

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Species in which dark brown fur (D) is dominant relative to light brown fur (d). Using the Punnett square below, predict the fre
Debora [2.8K]

Answer:

<h3>Genotype frequencies</h3>

25% DD

50% Dd

25% dd

or

1 DD: 2 Dd: 1 dd

<h3>Phenotype frequencies</h3>

75% Dark brown, 25% light brown

or 3 dark brown: 1 light brown

Explanation:

Two heterozygous parents have the genotypes Dd. Therefore, the cross is Dd x Dd.

           D                   d

D        DD                 Dd

d        <em>Dd                  dd</em>

<em />

25% (1:4) of the organisms have the genotype DD, and therefore the phenotype is dark brown,  since it has two copies of the dark brown fur allele (DD)

50% (1:2) of the organisms have the genotype Dd, and therefore, the phenotype is dark brown since dark brown fur (D) is dominant to light brown  fur (d).

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3 0
3 years ago
Impulses originating in the part of the brain called the medulla would most directly affect which body structure?
gtnhenbr [62]

The question is incomplete. The complete question is:

Question: Impulses originating in the part of the brain called the medulla would most directly affect which body structure?

a. A leg muscle

b. A ligament

c. An arm bone

d. The heart

Answer:

d. The heart

Explanation:

The medulla oblongata contains a number of reflex centers for regulating vital body functions such as heartbeat, breathing, and vasoconstriction. The medulla contains several nuclei, a collection of neuronal cell bodies.

For example, impulses originated in the cardiovascular center regulates the rate and force of the heartbeat and the diameter of blood vessels. Impulses from the cardiovascular center flow along sympathetic and parasympathetic neurons. An increase in sympathetic stimulation from the cardiovascular center of medulla increases heart rate and contractility while a decrease in sympathetic stimulation decreases heart rate and contractility.

5 0
4 years ago
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