Neuron cells contain long extensions called axons and dendrites that other cells in the body do not have. this is mainly due to the fact that a neuron cells have more complicated dna. b neuron cells are located in different areas of the body. c different genes are expressed in neuron cells. d other cells lose the genes that code for axons and dendrites.

Compare and contrast cladistics and phylogeny. what are their advantages and disadvantages? which is the most useful in understanding how an organism developed into its current form? which concept most strongly supports your opinion about the origin of any given organism?

Directions: read the descriptions of the four islands presented in the lesson. 1. list two new traits that each new species of rat might demonstrate as it adapts to the conditions on each island. 2. introduce one of the four new rat species to another island and describe one challenge it would encounter and one success as it adapts to its new environment.

Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins