Which of these are families of elements?

a.
metals and noble gases

b.
shells and nonmetals

c.
properties and rare earth elements

d.
metalloids and atoms

The families of the elements are determined depending on their properties. There are metals, nonmetals, and the metalloids. The nonmetals are also further classified depending on their properties. There are those that are Halogens, Noble Gases, etc. The answer to the question is letter A. metals and noble gases. 

The correct answer is b

This is what i found on google “phytoplankton, tiny organisms that live in the ocean, are autotrophs. some types of bacteria are autotrophs. most autotrophs use a process called photosynthesis to make their food.” i hope this you for what your looking for