Although having evolved independently, the tracheal tubes of mammals and insects are both supported by rigid tissues. the trache
a of a mammal is supported by cartilage, and the tracheae of an insect are supported by chitin. what selective pressure most likely led to the convergent evolution of these respiratory structures?
The answer is B.
Which is “When the air is in the respiratory
medium, there is a greater risk that the tracheal tubes will collapse. The
cartilage in the respiratory system gives support
to the tubes against negative or positive
pressure, during respiration, hence keep
it open.
When you manually crank the flashlight, a coil of wire inside the generator converts the mechanical energy into electrical energy. This allows an electrical current to flow through the flashlight, thus lighting the bulb of the flashlight.