please answer correctly thanks 2. Clams, mussels and oysters can avoid predation

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please answer correctly thanks

2. Clams, mussels and oysters can avoid predation by using their adductor muscles to tightly close their shells. Are there any other advantages to being able to close the shell tightly? What are the disadvantages of closing the shell tightly? 3. Why are the spatial relations in the squid so confusing? When the animal swims one end goes forward first. Why not call that the anterior end (instead of dorsal)? Alternatively, the eyes, mouth and tentacles are found at one end. Why not call that the anterior end? 4. The tubules of each annelid nephridium convey coelomic wastes and fluid outward toward the nephridiopores. The tubules are surrounded by capillaries from segmental ood vessels. What is the purpose of the intimate association between the blood vessels blood flow in the same or the opposite direction to the tubular fluid? Explain. and the tubules? In the most efficient countercurrent arrangement, should the

Explanation / Answer

Ans-2 the closed shell acts as significant habitat for the young oyster and also for the embryo as they got attach themselves to the closed shells of old oysters.

It also expel the water during the movement.

The disadvantage of tightly closing of shell is that the organism inside the shell become unable to secret it's sperm or eggs in water current as the shell is closed and there is no other way for passage of sperm or eggs.

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