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Answer:
- A Tongue-shaped structure called radula for grasping food --> Mollusca
- Fleshy lobe-like structure called parapodia --> Annelida
- Spongin fibers or spicules for support ---> Porifera
Explanation:
Radula: This is an organ used in feeding by mollusks. It constitutes a highly developed feeding organ. The radula has is conformed of small teeth-like structures located in rows. Lateral teeth vary in shape and size. The movements of the radula during feeding are complexes acting as a scratcher on the surface to get the food.
Parapodia: These are characteristic lateral appendixes that emerge and extend from each of the body segments of invertebrates such as polychaetes. The typical parapodium is a fleshy prolongation more or less laterally comprised and is composed of a superior branch (notopodium) and an inferior branch (parapodium).
Spicules: Sponges (Poriferous) skeleton is composed of calcium carbonate and siliceous micro-structures called spicules. Their morphology is so varied that it is used in taxonomy for identification and classification.
There are different kinds of spicules:
- Monoaxonic spicule: needle-shaped, straights or curves
- Tetraxonic spicules: they have four prolongations
- Triaxonic or Hexaxonic spicules
- Poliaxonic spicules
Two terms can be applied to any of these spicules kinds:
- Megaspicules: They are elongated and compose the main architecture of the sponge skeleton
- Microspicules: Variable in shape and size, with ancillary functions
Sponges have few predators because of the spicule structures and their high toxicity. Many of them are capable of perforating soft tissues and producing urticant substances.
The part of the nervous system that is used to help you think through situations is called the central.
Answer: Option C
<u>Explanation:</u>
The central nervous system comprises of the spinal cord and the brain. It is given the name as Central nervous system as it accelerates thinking and passes information. There are some important reflexes that mainly involve the spinal cord and central nervous system like thinking through the situations.
It controls our movements, thinking and acting. The central nervous system send signal from one cell to another cell. It gathers information from all over the body and transmits it to the other parts.
Answer:
The length of time for the processes of weathering and erosion to occur are very long, however some quick.
Depending on the force, erosion can happen quickly or take thousands of years.
However weathering usually takes a long time.
