Distribution of phenotypes within a population may be impacted by different types of natural selection. These types of selection include;
Directional selection involves a change in the environment shifts of phenotypes observed. Example is the giraffe neck-length, where the length got longer and longer over time to reach the leaves at the top of trees.
Stabilizing selection , this is a selection where an average phenotype is favored. example is number of eggs laid by birds such that too many eggs will be a waste of energy because some chicks would starve.
Disruptive selection is a selection where individuals with an average value of a trait are affected most while those with values below average are affected least. Example small individuals are capable of hiding from predators while big individuals can not fit in the hiding place but instead will fight with predators.
Answer:
The cells of the visual cortex are neurons in the brain's visual system that respond to particular features of a stimulus.
Explanation:
These neurons respond to stimuli presented to both eyes. Simple cells receive innervation directly from thalamic cells and respond to light stimuli with defined orientation and with specific configuration and location in the visual field. Complex cells also respond to the orientation parameter.
These cells trigger action potentials when the visual stimulus appears within their receptive field.
Answer:
a. veins and arteries
b.diaphragm
c.kidney
d.lung
e.4
f.left auricle(atrium) , right auricle(atrium)
g.left ventricle, right ventricle
h.blood plasma
i.digestive
j.buccal cavity ,saliva
k.bile
l.excretory
m.kidneys
Explanation:
Calcareous ooze<span> is a form of calcium carbonate derived from planktonic organisms that accumulates on the sea floor. ... Below this depth, calcium carbonate begins to dissolve in the ocean, and only non-</span>calcareous<span> sediments are stable, such as</span>siliceous ooze<span> or pelagic red clay.</span>
Answer:
A period happens because of changes in hormones in the frame. Hormones are chemical messengers. The ovaries launch the lady hormones estrogen and progesterone . those hormones motive the liner of the uterus (or womb) to build up. The constructed-up lining is prepared for a fertilized egg to connect to and begin developing. If there is no fertilized egg, the liner breaks down and bleeds. Then the identical manner occurs all once more.
It normally takes about a month for the liner to build up, then smash down. this is why a lot of ladies and women get their periods round once a month.
Source:
https://kidshealth.org/en/teens/menstruation.html
https://www.plannedparenthood.org/learn/health-and-wellness/menstruation
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