URGENTTT!!
how insulin taken by breathing it in enters the blood?

The idea of inhaling insulin has been around for decades. It wasn't until the 1990s that researchers made it possible. With an inhaler much like the ones people with asthma use, you breathe a fine insulin powder into your lungs. There, it enters your blood through tiny blood vessels.

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?