Millions of species exist today. based on darwin's theory of evolution, which of the following best explains how this is possible?

a. organisms pass on acquired traits to evolve into more advanced life forms.

b. organisms are selectively bred to create new species.

c. new species are crossed with each other to form many different organisms.

d. different genetic variations in organisms are selected in different habitats.

What type of competition exsist between two species. turtles and fish

One function of the poly-a tail on eukaryotic mrna sequences is to the mrna be transported from the nucleus to the cytoplasm. prokaryotic mrna also has a poly-a tail. choose the best explanation of the prokaryotic poly-a tail. a. prokaryotic poly-a tails are composed of a different molecular structure compared with eukaryotic poly-a tails. b. prokaryotic poly-a tails have the same functions as eukaryotic poly-a tails, because this process is highly conserved throughout different species. c. prokaryotic poly-a tails aren't important, because prokaryotes don't have nuclei. d. prokaryotic poly-a tails have other functions,because prokaryotes don't have nuclei.

Anormal appearing couple is found to be heterozygous recessive for albinism both have the genotype aa the gene responsible for albinism is recessive to the normal pigment-producing gene what are the changes of their children being albino