Sickle cell anemia is a genetic condition that occurs because of a single point mutation in the DNA gene for hemoglobin. How is this mutation
expressed in humans?
A. The chromosome carrying this gene changes shape during cell reproduction.
B. The carbohydrate coded by the DNA has a different structure.
C. The hormones in the blood are changed by increased differences in genes.
D. The protein coded by the DNA has a different amino acid sequence.

answer; ///i believe that the correct answer is (the worksheet);

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

spiders belong to a group of arachnids.

arachnids have the following traits :

they have two body parts.

they have eight legs unlike insects which have 6 legs.

they have no wings.

these traits distinguish them from insects.

the information that antonio is doubting us the statement that spiders differences are as a result of being first to evolve.

this is because the evolution of one species is independent of the other species.