Which of the following is true? a. introduction of a gene construct expressing telomerase into melanoma cells causes them to differentiate b. telomeres shorten by one hexanucleotide repeat each generation c. senescence is observed in vivo in precancerous lesions. d. dicentric chromosomes and anaphase bridges are hallmarks of senescent cells e. compared to primary cells, established cell lines typically have increased population doublings and increased p15 expression.

answer; ///i believe that the correct answer is (a) specialized cells)

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.

it creates acid rain