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.

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.