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Anettt [7]
3 years ago
10

Echinoderms _____. _____ Select one: a. have an exoskeleton of hard calcareous plates b. often use tube feet to move around in t

heir environment c. digest their food outside of the organism d. circulate hemolymph in their water vascular system e. are most often found in freshwater environments
Biology
1 answer:
atroni [7]3 years ago
4 0

Answer:

B. often use tube feet to move around in their environment

Explanation:

Tube feet are tiny tubular projections of echinoderms on the underside (oral side). They are a member of the echinoderm water vascular system.

Tubular feet are used for feeding, breathing and shifting. They are arranged around the sides, in grooves. They work by hydraulic pressure. They are used to transfer food in the centre to the oral mouth, and may stick to surfaces. Tube feet allow certain animals to stick and travel slowly to the ocean floor. for example starfish uses tube feet for the above functions.

Hence, the correct option is B.

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The major means of propulsion through the alimentary canal is peristalsis.
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<h2>Peristalsis </h2>

Explanation:

  • Peristalsis is simply a series of muscle contractions, these contractions occur in the digestive tract
  • Peristalsis is also observed in the tubes that connect the kidneys to the bladder
  • Peristalsis is an automatic and important process which moves: food through the digestive system, urine from the kidneys into the bladder  and bile from the gallbladder into the duodenum
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6 0
3 years ago
Which of these is an example of a chemical change?
lawyer [7]

The correct options are, frying an egg and burning candle.

Explanation :

Physical change : It is a change in which no new compounds are formed only changes occurs in size or state of substance. In this, there is no changes in the substance or compound.

Chemical change : It is a change in which a new compounds are formed by the chemical reaction. Changes occurs in their chemical composition and properties.

Frying an egg : It is a chemical change because a new substance is form by heating.

Burning a candle : It is chemical change because new substances are formed (carbon dioxide, water and heat) by burning.

Boiling alcohol : It is physical change because only changes in the state.

Melting and ice : It is a physical change because only changes in the state.

Making coffee : It is a physical change because no new substance is formed.

Therefore, frying an egg and burning candle are the example of chemical change.

4 0
3 years ago
Read 2 more answers
What is an undefined nuclear region containing only nucleic acid
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Nucleoid is the answer
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If tall is dominant to short and two short parents are crossed ,how many offspring will be tall?
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Answer:bunny

Explanation:hhii

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Compares and contrasts the structure and function of viruses with all living cells.,
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<span>The major difference between viruses and living cells is that viruses do not have nuclei while living cells do. A second major difference is that viruses need a host cell to survive while living cells do not. For the most part, viruses just contain genetic material (typically in the form of RNA) inside of a capsid. Living cells have many more organelles, including ribosomes and cytoplasm, which viruses lack.</span>
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