Scientists think the earth is approximately how old? 2 billion years 3 billion years 4 ½ billion years 6 ½ billion years

4 ½ billion years approximately

Explanation:

The age of the earth is a common question that scientists and enthusiasts have been trying to answer for thousands of years. Nowadays our current level of technology allows us to get an estimated answer analyzing radioactive age-dating from the oldest-known terrestrial and lunar samples and is close to 4.54 billion years.

answer by yourhope:

hi! : )

in which structure in the nucleus are ribosomes made?

b) nucleolus!

: )

the sphincter muscles at the end of the digestive tract is the anus.