If the inner lining of the air sacs neither thin nor highly vascularized, then it can be inferred that AIR SACS ARE CANNOT BE THE SITES OF GASEOUS EXCHANGE BETWEEN AIR AND BLOOD. Air sacs are generally lined with mucus and surrounded with blood capillaries.
In case of birds, air sacs play an important role in respiratory system.
Answer:
Conservation efforts have had a positive impact on ecosystems that have been previously harmed due to human activity. Conservation efforts have helped preserve and even restore habitats that had been damaged or threatened by human activity. They have also helped protect endangered species.
Cells become haploid in cytokinesis of meiosis one because the chromosomes have divided.
Answer:
C
Explanation:
The cell wall in only present in plant cells, not animal cells. Hence, the fact that plant cells are rectangular while animal cells are more circular.
