What are the main principles of the theory of natural selection? a. there are only three principles of the theory of natural selection - variation, overproduction, and adaptation. b. adaptation is the only principle of the theory of natural selection. c. variation, overproduction, adaptation, and descent with modification d. variation, reproduction, adaptation, and descent with modification

15 ! come and answer! a(n) disease is caused by a pathogen and can spread among organisms. a infectious b noninfectious c toxic d contaminated

Me with biology endocrine system crossword also image left i need with hw

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.