Answer:
Endoskeleton
Explanation:
An internal skeleton is called an endoskeleton, which is what vertebrates have. A sponge endoskeleton consists of short, sharp rods called spicules
Spicules are made of silica, calcium carbonate, etc.
Answer:
The tendency of water molecules to stick to other molecules also allows water to dissolve substances that are important to life, such as ions, DNA, and many proteins. This is necessary for life because molecules that have been dissolved in water or another polar solvent interact with each other more readily.
Answer:
perhaps you live by a pond.The water,wind, and tempature are all antibiotic factors.The fish,frogs,and bugs are all living so they are the biotic factors.
Is there a multiple choice or fill in the blank?
Answer: Steep, high velocity, no silting. The high water speed picks up silt from the bottom instead of letting it settle to the bottom. When the land gets level like often happens at the mouth of rivers where the water spreads out and slows down, silt settles to the bottom and you could get a wide, shallow delta.
(Put in own words this is from online hope it helps)
