Radioactive elements are produced in nature and scientific experiments.

This software has forward compatibility.

This software maintains backward compatibility.

He was diagnosed with congestive heart failure.

The success of this project is influenced by a lot of uncertainty.

The sexology class is very interesting.

In mathematics, it is important to examine the parity of numbers.

Sex chromosomes play a crucial role in determining the sex of an organism.

Sex chromosomes play an important role in determining the sex of an organism.

We have a responsibility to protect the biodiversity of the Earth.