Question

Which elements are common to all organisms? Check all that apply.

Answer 1

2. oxygen
4. hydrogen

Answer 2

There exist chemical elements that are found in a greater quantity in the living organisms. They are:

- Oxygen: the most abundant element in living organisms. Humans is composed in a 65% of it.

- Carbon: the basis of all life on Earth. Living organisms are also refered to as carbon-based life forms.

- Hydrogen: the simplest element containing one proton and bonding easily with other elements.

- Nitrogen: composes around 80% of air on Earth. Very important in the plant life.

- Sulfur: component of cysteine and methionine, essential amino acids for living organisms.

- Phosphorus: used in the formation os phospholipids  a major component of cell membrane of living organisms.