It's actually A. Vertebrate have a hard out shell.
Answer:
These structures that protect the sponges from most predators, but not turtles, are spicules.
Explanation:
Sponges <em>skeleton</em> is composed of <em>calcium carbonate and siliceous</em> micro-structures called <u>spicules</u>. Their morphology is so varied that it is used in taxonomy for identification and classification.
There are different kinds of spicules:
- <em>Monoaxonic spicule</em>: needle-shaped, straights or curves
- <em>Tetraxonic spicules:</em> they have four prolongations
- <em>Triaxonic or Hexaxonic spicules</em>
- <em>Poliaxonic spicules </em>
Two terms can be applied to any of these spicules kinds:
- <em>Megaspicules</em>: They are elongated and compose the main architecture of the sponge skeleton
- <em>Microspicules</em>: Variable in shape and size, with ancillary functions
Sponges have few predators thank to the spicule structures and their high toxicity. Many of them are capable of perforating soft tissues and producing urticant substances.
Answer:
Only supplies a set amount of energy depending on distance from sun
David smith and Thomas scott(2003) argue for distributed coding based on the finding that more central location in the taste system,neurons are tuned broadly, with many neurons responding to more than one taste quality The two argued this because there were neuron that respond best on one compound such as sour
I think it's B. Because <span>DNA is a double helix formed by base pairs attached to a sugar-phosphate backbone.</span>
