Compare humans inhaling and exhaling to how gills work. Humans | Fish |
Inhaling:
Exhaling

Explanation:

Gills and lungs are the two types of respiratory systems that occur in vertebrates.  

Their main function is to facilitate gas exchange.  

useful link :

https://pediaa.com/what-is-the-difference-between-gills-and-lungs/#:~:text=The%20main%20difference%20between%20gills,while%20mostly%20tetrapods%20use%20lungs.

spiders belong to a group of arachnids.

arachnids have the following traits :

they have two body parts.

they have eight legs unlike insects which have 6 legs.

they have no wings.

these traits distinguish them from insects.

the information that antonio is doubting us the statement that spiders differences are as a result of being first to evolve.

this is because the evolution of one species is independent of the other species.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called