The brain and spinal cord are part of the nervous system.
The electrical charges that act as nervous signals are called .
Jellyfish do not have a brain. Instead their nervous system is called a .
After nervous systems began to develop in bilaterally symmetric animals, some developed ventral, or front, nerve cords, while chordates developed nerve cords.
Skeletons that allow for movement by using muscles and squeezing liquid to change the body shape are called skeletons.
do not grow with arthropods, and so occasionally must be shed and regrown from chitin.
Muscles move endo- and exoskeletons by .
is the joining of two gametes called sperm and egg.
A fish that lays her eggs in a cluster is initiating fertilization.
are an adaptation by reptiles to allow for reproduction and embryo development on land.
Describe three different strategies used by three different animals to thermoregulate.
If you see a snake coiled up in a sunny patch of grass, what can you probably conclude about the type of thermoregulator it is. Why?

1. central

2.  action potential

3.  nerve net

4.  dorsal

5.  hydrostatic

6.  Exoskeletons

7.  contraction/contracting

8.  Fertilization

9.  external fertilization

10.  Eggs

11.  Animals with fur thermoregulate by panting. Winged birds will flap against their mouths/heads to dissipate heat. Humans will produce sweat to evaporatively cool. Polar bears have developed blubber. Bears drop body temperatures during hibernation.

12.  Seeing a snake using the warmth of the sun leads us to conclude that it is likely a thermo conformer that cannot produce its own body heat.

Explanation:penn-Foster

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

hope this   and an i get brainlsiest

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