Water vascular system is characteristic of
Protozoa
Porifera
Annelida
Echinodermata
D.
Echinodermata
Ambulacral system or water vascular system is a characteristic feature of echinoderms. This system comprises the system of canals and tube feet. Tube feet are also a characteristic feature of echinoderms, which help in adhesion, respiration, food capturing and locomotion.
Posterior pituitary gland
produces and store hormones
stores 6 trophic honnones
stores and releases ADH and oxytocin
release and store growth and thyroid stimulating hormone
The instrument used for measuring blood pressure is
electrocardiograph
X-rays
sphygmomanometer
electroencephalograph
Earthworms are economically important for man as these are used as
bait for catching fish
food of poultry
medicine for gout
All of the above