Asked by mehaksaini | 14th May, 2009, 02:56: PM

Expert Answer:

1) Auxin

2) Thymosin

3) They are provided with a rich supply of blood. This allows gas exchange to take place between the blood and the surrounding air and water.

Kindly post each of the remaining questions as separate queries.

Answered by  | 15th May, 2009, 09:04: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.