Answer:
It has a very high Maintenance and set up cost. The technology needed is not yet mature so alot of development is needed. Many rural farmers may loose living and become unemployed
Benthic sessile animals usually utilize external fertilization. They are marine animals and water helps in the mobility of male sperms towards the egg. The process through which eggs and sperms are released into the water is known as spawning. Some marine plants like algae also use external fertilization for reproduction.