GENERAL HISTOLOGY

Detailed explanation-1: -Also, humans pull all echinoderms (starfish, sea urchins, sea cucumbers, sea lilies and brittle stars) out of their natural habitat to be directly sold in the pet trade. Both of these problems affect the number of echinoderms in the wild.

Detailed explanation-2: -In some countries, echinoderms are considered delicacies. Around 50, 000 tons of sea urchins are captured each year for food. They are consumed mostly in Japan, Peru, Spain and France. Both male and female gonads of sea urchins are also consumed.

Detailed explanation-3: -While most echinoderms are poisonous, and many have sharp spines or spicules capable of causing injury, only a few members of the Asteroidea, Echinoidea, and Holothuroidea classes are capable of causing venomous injuries in humans.

Detailed explanation-4: -The lack of control in echinoderm extraction is a major threat in the Caribbean region. However, the greatest threats to this group of animals come from anthropogenic disturbances like sedimentation and coastal pollution.