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Roman55 [17]
3 years ago
13

How many veins and arteries are present between the maternal and the fetal circulatory system by the fifth week of pregnancy?

Biology
1 answer:
NemiM [27]3 years ago
8 0
One vein and Two arteries are present. 
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Why does a fever cause a life-threatening problem​
Sav [38]

Answer:

The fever is the immune system's attempt to kill the infection. Very rarely, however, this immune response can result in a fever high enough to cause permanent harm or even life-threatening complications due to overheating.

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3 years ago
A new kind of tulip is produced that develops only purple or pink flowers. Assume that flower color is controlled by a single-ge
g100num [7]

Answer:

Explanation:

the purple allele (C) is dominant to the pink allele (c).

The frequency of C represents p while that of c represent q. Using the formula p+q= 1

The proportion of pink flower is 153/1000 = 0.153. This is also the frequency of the genotype cc (q^2).

Thud to find q which is the frequency of the c allele,

q = √0.153

q = 0.3912

From the formula p +q = 1 we can find p p = 1 - 0.3912

p which is the frequency of the C allele

p = 0.6088.

B. the proportion of all purple flowering plants that are heterozygotes and homozygotes is 847 / 1000 = 0.847

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4 years ago
Carnivore that feeds on primary consumers
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We need the options in order to answer
5 0
3 years ago
Which brain region is thought to be responsible for creating stressful memory imprints onto the nervous system?
Marina86 [1]

The correct answer is amygdala.

The amygdala is the part of the limbic system of the brain located within the temporal lobe. The functions of the amygdala include the processing of memory, emotional responses (fear, anxiety, and aggression), decisions.. It’s also a brain structure involved in turning on the stress response and actions that are related to stress and self-defense.


3 0
4 years ago
What is responsible for the yellow-orange coloration of leaves in the fall?
mixer [17]

The correct answer is - C) carotenoids.

The majority of the trees from the mid-latitude forests tend to shade their leaves in the autumn. This process occurs because of the seasonal changes in the climate, where the trees tend to be almost not-active during the winter, so in order to preserve as much energy and nutrients as possible they get read off their leaves.

It is not a sudden process, but it takes some time, where the leaves from the initial green color start to change to yellowish, than towards orange, reddish, or brownish before they fall.

The reason why this coloration appears in the leaves when the tree starts to process of shading them off are carotenoids. The carotenoids found in the leaves, the lutein and the beta-caroten, thorugh the xantophills and the flavonoids give a yellowish color to the leaves, thus we get the beautiful autumn colors and landscapes.

7 0
3 years ago
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