Why do bird's bones look different from many other animals?

Which of the following is the main purpose of a human community?

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

Glucose is a form of sugar found in the blood cells use glucose as a source of energy, but too much or too little can cause serious health issues so, the body uses the hormone insulin to regulate glucose n the blood insulin maintain glucose levels in the blood if blood glucose lovels got very high, what would you expect to see happen to insulin levels?