If the inner lining of the air sacs neither thin nor highly vascularized, then it can be inferred that AIR SACS ARE CANNOT BE THE SITES OF GASEOUS EXCHANGE BETWEEN AIR AND BLOOD. Air sacs are generally lined with mucus and surrounded with blood capillaries.
In case of birds, air sacs play an important role in respiratory system.
The answer is
B, a euglena uses a flagella in order to move. Euglena is a one celled organism
under the Kingdom Protista. A flagella (or flagellum plural) is a long strand
like structure that is located in the front end part (more like a tail in front).
It flips to the left and right in order for the organism to move. It is
connected to the reservoir, which contains the storage of food for the
organism.
The aquifer which will be most effective in purifying polluted ground water is AN AQUIFER COMPOSED MAINLY OF SAND.
An aquifer refers to a zone of permeable rock strata which transmit ground water freely. An aquifer must be permeable and porous. Ground water can be extracted from an aquifer by using a water well.
Answer:
A
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