The following diagram shows two cell types: a neuron and a muscle cell. A
neuron
muscle cell
Which statement best describes why the neuron and muscle cell are different?
Choose 1
Neurons and muscle cells contain the same proteins, but the cells are different due to their
locations in the body.
B
Muscle cells contain proteins that allow them to maintain a branching shape, while neurons do
not.
Neurons and muscle cells each make a different set of proteins, which determines each cell
type's structure and function.

The images show fossils of a modern bird and two extinct organisms (a tyrannosaurus rex and an archaeopteryx). based on the structure of the three organisms, it can be concluded that . the archaeopteryx and bird have wings, while dinosaurs have limbs. so, it can be concluded that .

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 is thought to have caused the mass extinction at the end of the cretaceous period?