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.
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
The instrument used for measuring blood pressure is
electrocardiograph
X-rays
sphygmomanometer
electroencephalograph
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