Question

!!! One Medal Question !!!

Answer 1

@wolfe8

Answer 2

- Describe the range of variation in the nervous systems of invertebrates. –
http://www.biologyreference.com/Mo-Nu/Nervous-Systems.html

Distinguish among asymmetry, radial symmetry, and bilateral symmetry. –
Asymmetry, are animals that cannot be cut into equal parts. Hence- Asymmetry, no symmetry or not balance. Examples: Amoeba and sponge
Radial symmetry- hence- radial as in radius, has a center axis and can be cut into 3 or more equal parts. Example: Starfish
Bilateral symmetry-have symmetrical vertebrates, if you draw a line on the center of an animal, it has equal parts. Example: Humans, Fish, butterfly.

Define cephalization.
http://www.ask.com/question/cephalization-animals

Answer 3

Cephalization is intrinsically connected with a change in symmetry. It accompanied the move to bilateral symmetry made in flatworms, with ocelli and pinnae placed in the head region. In addition to a concentration of sense organs, all animals from annelids on also place the mouth in the head region.
http://en.wikipedia.org/wiki/Cephalization

Answer 4

this is how they are bilateral http://img.sparknotes.com/101s/biology/20-1.jpg

Answer 5

http://evolution.berkeley.edu/evolibrary/images/evo/cephalization_clade.gif

Answer 6

Words Please ?

Answer 7

Like i mentioned before, bilateral symmetry is when there's two opposite sides that are identical to each other. Cephalization is like an evolutionary type of organisms and one example are the flatworms and the shape of it is bilateral symmetry. The pictures i showed u above is for you to analyze and observe the body parts on one of the examples of Cephalization. Define it, then write why are they bilateral.