Mangrove forests have traditionally been viewed as
a. unhealthy
b. unproductive
c. wastelands
d. all of the above

The correct answer is option D

Mangrove forests are traditionally been viewed as unhealthy, wastelands and unproductive.

Earlier mangroves were considered as a waste for the environment and had no ecological value.

They were a messy plant with no use that was present along the coast. They were considered unhealthy as it was not useful.

Now a days mangroves are considered useful as it improves the water quality and serves as a breeding place for fishes that helps the fisherman economically.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.