Four million years ago, a river changed course and cut through the center of the forest creating two geographically isolated forests of equal size, Forest X and Forest Z. It divided the population of each species (1, 2, and 3) equally between the forests, where each population eventually evolved to become a new species. Currently, there are a total of six lizard species living in the two forests: species 4, 5, and 6, located in the north, central, and southern regions respectively, in Forest X; and species 7, 8, and 9, located in the north, central, and southern regions respectively, in Forest Z. Based on this information, what is the most likely phylogeny for the six living lizard species

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.

Select the correct answer from each drop-down menu. the lac operon in e.coli regulates genes that code for enzymes required for breakdown of lactose. the lac operon is operon that is activated in the presence of .

This connective tissue consists of large round densely packed cells with the nucleus pushed to one side.