Scientists believe that mature salmon swimming back up their home river system detect odors to guide them on their journey. in fact, salmon with cotton stuffed in the nostrils on each side of their head cannot find their way back home. the sensory pathway to the brain begins with of the salmon. a) chemoreceptors in the nose b) photoreceptors in the eyes c) electromagnetic receptors in the ears d) sensory cells at the base of the brain

Answer is A. chemoreceptors in the nose.

In aquatic animals smelling is equal to tasting in water. Salmon have a strong sense of smell. Salmon may use chemical cues through chemoreceptors. Chemical cues are unique to their natal stream, use as a mechanism to home onto the entrance of the stream. The way salmon locate their home rivers with such accurate was indeed because they could recognize its characteristic smell.

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.

wegner's theory did not explain how the continents could move

explanation: