The excretory system is a passive biological system that removes excess, unnecessary materials from the body fluids of an organism, so as to help maintain internal chemical homeostasis and prevent damage...
Learning objective:
By the end of this chapter, you will be able to-
Define Seed, Parts of Seed, types of the seed
Factor required for the seed to grow into new plant or sapling
Define Germination...
Fig. 15 The arrangement of the air sacs, and lungs in birds
Fig. 16 The anatomy of bird's respiratory system, showing the relationships of the trachea, primary and intra-pulmonary bronchi,...