Linnaeus' concept of kinds differed from ours today in holding that:

a. a kind may be a species, genus, or family
b. a kind is a genus
c. variation may exist within a kind
d. variation does not exist within a kind

Answer is D. Variation does not exist within a kind.

Explanation:

Linnaeus is regarded as the father of classification. This is because, his method or system of classifying and naming of organism, known as taxonomy, is still relevant up till today.

He formulated the binomial nomenclature, which is the modern system of naming organisms.

Linnaeus system includes domain, kingdom, phylum, class, order, family, genus and specie.

answer; 60-100; beats per minute

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .