1. which behavior can both humans and flatworms do a form images from sensory signals b smell fresh food c communicate verbally d see the shape of an approaching predator 2. which is a cell of the nervous system a. dendrite b neuron c axon d sodium

 1. B. smell fresh food   2. B. neuron

1. Flatworms are dorsoventrally flattened animals with bilateral symmetry. They lack skeleton. Flatworms are able to sense and respond to stimuli such as respond to light, the eye-spots can detect light and allow the flatworms to respond to it, respond to chemical, pits on the side of their head regions that allow the flatworms to respond (like smelling) and respond to touch, the auricles on either side of the head region can sense touch and allow the flatworms to respond.

2. Neuron is the cell of a nervous system. Neurons receive information, integrate it, and pass it. Along with neurons, the nervous system contains other specialized cells called glial cells which provide structural and metabolic support.  

b. the carbon cycle ensures living things have a source of hydrogen

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)