<span>The
correct answer is pharyngeal pouches.</span>
<span>All
chordates for at least some period of their life have pharyngeal pouches (pharyngeal
slits). Those are the openings in the pharynx with the function in the
filter-feeding. Pharyngeal slits are present during the embryonic stages of
tetrapod development. They <span>develop into gill arches (bony fish) and into the jaw and inner ear (terrestrial
animals).</span></span>
Answer:
- Physical and chemical barriers
- non-specific innate responses
- specific adaptive responses
<u>The differences are...</u>
The first barrier is the physical and chemical barrier. It is the first line of defense when in contact with outside sources, this can be through the skin, earwax, nose-hair, etc.
The second barrier, the non-specific innate response, is after these outside sources have somehow managed to pass through the first barrier. They come into contact with cells and enzymes that help to defeat them.
The third barrier, the specific adaptive response, is the body's way of dealing with pathogens that the body has encountered before. (B cells activate)
Answer:c. Two identical cells are formed
Explanation:
Answer AND Explanation:
As light reflected from an external object enters the eye, it is refracted by the cornea, aqueous humour, the lens and vitreous humour so that an image is focused on the retina. The image is real, upside down and smaller than the object. The photoreceptor cells are stimulated by the reflected light and impulses are set off. The impulses are transmitted by neurons through the optic nerve to the optic region of the brain. The brain interprets the impulse as an upright impression of the object.
