Epidermis
I think you coppied and pasted it one to many times, so I hope it's just one answer.
Ultraviolet light primarily causes the production of Vitamin D3 in the cells of the epidermis. Smaller amounts are also produced in the dermis and hypodermis.
Ultraviolet light stimulates the production of vitamin D3 primarily in the cells of the epidermis, which is the outermost layer of your skin. Additionally, a smaller amount of vitamin D3 production happens in the deeper layer known as the dermis and the hypodermis. However, most references will identify the epidermis as the main site for this production because it has the highest exposure to sunlight, which is crucial for vitamin D3 synthesis.
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The cranial cavity and the vertebral canal contain the spinal cord
Vertebrae is the synonym of spine. Inside the spine, there will be spinal cord protected by the nearby bone. Spinal cord will divided into many smaller cords after leaving the spine and spread through the body to carry signal from/to the brain. Without the spinal cord, the brain will not be able to reach and control the body.
The cranial cavity and vertebral canal contain the brain and spinal cord, respectively, which make up the central nervous system and are protected by cerebrospinal fluid.
The cranial cavity and the vertebral canal contain the central nervous system, which includes the brain and the spinal cord respectively. Vertebrate animals have two major body cavities: the dorsal cavity and the ventral cavity. The dorsal cavity contains the cranial cavity, which fills most of the upper part of the skull and houses the brain, and the spinal cavity, also known as the vertebral canal, which is a long, narrow cavity inside the vertebral column that contains the spinal cord. These two cavities are continuous with one another, forming a protective environment for the central nervous system complemented by cerebrospinal fluid, which acts as a cushion and circulates through both cavities and their contained structures.
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b. Reinforcement is a type of natural selection.
c. Reinforcement decreases the morphological difference between two incipient species.
d. Reinforcement is also called dispersive selection
The statements about reinforcement is true is that Reinforcement decreases the morphological difference between two incipient species.
Option C is correct.
Reinforcement is described as a type of natural selection that occurs when two populations that are becoming reproductively isolated from each other start to develop preferences for mates from their own population.
This can lead to a decrease in the morphological difference between the two populations, as they become more adapted to each other's mating preferences.
In conclusion, reinforcement is a type of natural selection, not the other way around. Option d is incorrect because reinforcement is also called assortative mating, not dispersive selection.
Therefore option B is correct
Learn more about reinforcement at:
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the correct answer choice is "C"
Thank you