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are non diffusible through cell membrane
control metamorphosis and secon dary sexual characters
are always proteinaceous
control the growth, development and differentiation of body tissues
How do most insects respire?
How many bones are there in a newly born infant -
How many bones are there in the human body -
How many canine teeth does an adult human have?
How many chambers does a human heart have?
How many layers of skin does a human have?
How many neck canal cells are found in the archegonium of a fern
How many red blood cells does the bone marrow produce every second?
How many teeth does a normal adult dog have?
How many times does the heart beat approx. in a minute in humans