There Are Three Domains Used to Categorize Life Forms That

question 80

Short Answer

There are three domains used to categorize life forms that have evolved separately for about a billion years: _______, _______, and _______.

---

Definitions:

Spring Pin

A type of fastener used to secure two or more components together, made from sprung (elastic) steel allowing it to compress and then expand for a secure fit.

Zerk Fitting

A grease fitting used to deliver lubricant under pressure into a specific location, commonly found in mechanical systems like automotive suspensions.

Trailer Pintle Hook

A type of tow hitch that uses a pivoting arm and hook mechanism to connect a trailer to a towing vehicle.

Welding

Welding is a fabrication process that joins materials, usually metals or thermoplastics, by using high heat to melt the parts together and allowing them to cool, causing fusion.