Gassed, 1919, by John Singer Sargent.
According to the CDC, tooth decayaffects more than one-fourth of U.S. children aged 2 to 5.Tooth decay is thedamage of the structure of the tooth which is caused by acids that are producedwhen sugar is being broken down by plaque bacteria in the mouth. Tooth decay is the primary cause of tooth loss in children in the UnitedStates.
b. air
c. water
d. all of the above
d. all of the above
Answer: The correct answer is-
A. organs, but no true body cavity.
Based on the presence of body cavity ( also called coelom), multicellular animals can be classified as acoelomates ( no true body cavity), coelomates ( having true body cavity), pseudocoelomates ( false body cavity).
Roundworms are pseudocoelomic. This means that organs are present but the body cavity is not lined by mesodermal epithelium.
Body cavity is present between the external wall of body and the intestine and it baths the different body organs.
Thus, option A) is the right answer.
Answer:
Option A
Explanation:
All bilateral organisms have coelomates (cavity). However a Pseudocoelomate organism have a false cavity. By false cavity, we mean that there is a body cavity which is filled with fluid and all internal organs bathe in it including alimentary canal system , reproductive system etc. Unlike a coelom, Pseudocoelomate organism do not have body cavity completely lined with mesodermal cells.
hence, option A is correct