About how long ago did modern humans migrate to Austrialia?

Aprrox. 50,000 years ago

Explanation:

The actual time frame is not really known, but about 40,000-70,000 years is what most evidence shows. There are several structures dating 65,000 years, but most artifacts discovered were from about 48,000 years ago.

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.

d

step-by-step explanation:

an inequality is an expression which means more than one number is a solution. we graph the solutions on a number line to show all possible values. we graph using circles and arrows.

this is a filled in circle on -2 so this is . this means only answers c and d are options.

answer d points to the right.