7) Normal human body cells contain
chromosomes and are called diploid cells.

The correct answer is - 2n or two sets.

Explanation:

In normal human cells, there are 46 chromosomes that are present in two sets or 2n that means there are only 23 pairs of chromosomes. These type of cells known as diploid cells and represented by 2n where is n is equal to the number of chromosomes.

These cells contain two complete sets of homologous chromosomes where each set comes from a particular parent cell. It is double of haploid cells. Nearly all human cells carry two sets of chromosomes in cells.

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements