Which term describes a pure substance that is made up of only one type of atom?
o matter
rock
compound
o element
re
ratele
+ sono
f

The substance which is composed of only one type of atom is called an element.

Option D

Explanation:

In chemistry, elements are defined as substance with one type of atom. Due to the presence of only one type of atom in it, elements are considered pure. When one or two elements combine in an appropriate ratio, it leads to the formation of compound.

There are 118 elements used in chemistry which have been arranged in tabular form and are called a periodic table. Among them, some are naturally occurring and some are man-made.

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.