Stress<span>A nonspecific response of the body to any demand put upon it that can be both physical and mental</span>
Covalent bonds is important in four macromolecules such as proteins (polymers of amino
acids), nucleic acids (polymers of nucleotides), carbohydrates (polymers of
sugars) and lipids (with a variety of modular constituents) because they served
as a basic structure of macromolecules.
In addition, the resulting covalent bond is a result
of sharing a pair of electrons, one from each atom or molecular units.
Answer:
four billion years ago the earth had a layer of ozone gas
The answer would be (A) Haploid Cells
