Check all the characteristics below that describe elements. one type of atom a pure substance more than one type of atom chemically combined elements

The characteristics that describe elements are:

A chemical element is called a substance that is made up of atoms of the same type whose nuclei show the same number of protons.

Therefore, we can conclude that elements are atoms that have the same number of protons in their nucleus.

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The correct options are:

Explanation:

An element can be described as a substance having the same number of protons in its nucleus. It cannot be broken down further in a chemical reaction. It is made up of one type of atom and is a pure substance. For example, the atomic number of oxygen is 8. Hence,  the element, oxygen, has   8 protons.

In total, there have been 118 elements that have been discovered and places in the periodic table.

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white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.