Which of the following is the best definition of DNA?

A. A molecule made up of a long string of amino acids

B. A double-stranded molecule with coded instructions for an
organism's physical characteristics

C. Any organic molecule that contains carbon, hydrogen, and oxygen

D. The basic unit of a nucleic acid, made of a phosphate, sugar ring,
and nucleotide base

The diagram below represents a marine food web and a process that can harm the human population. each circle represents an organism and the smaller dots inside them represent a toxic substance. what is being represented and how does it harm the population? the diagram represents biological half-life, in which toxins build up in organisms higher up on the food chain, and this can negatively impact humans who consume the organisms and the toxic substance. the diagram represents biomagnification, in which toxins build up in organisms higher up on the food chain, and this can negatively impact humans who consume the organisms and the toxic substance. the diagram represents the process by which different organisms prey upon each other; this can impact the human population by reducing the number of organisms that do not contain the toxin. the diagram represents the way that toxins are metabolized by living organisms, with those at greater trophic levels able to metabolize more efficiently than those at lower levels. this means that those at higher tropic levels are safer for humans to consume compared to the organisms at lower trophic levels.

List two modern organisms that have pentameral symmetry

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?