4 points 19. Four mixtures are made by combining two clear liquids, and observations are made. Which mixture demonstrates that a chemical change has occurred? * Mixture 1: The combined liquids have a greater mass than either of the starting liquids. Mixture 2: The liquids, when mixed, produce a white solid, which settles to the bottom. O Mixture 3: The mixture of the two liquids takes the shape of the container. Mixture 4: The denser of the two liquids lies below the other, less dense liquid.​

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.

What are the most explosive events that occur on the sun? umbras solar flares solar winds prominences

What do all macromolecules have in common with each other? oa. they all are formed from the same elements.ob. they all have major roles in cell membranesoc. they all act as catalysts in the body.od. they all have peptide bonds between carbon atoms.