living organisms Flashcards
living organisms are composed of about how many chemical elements?
25 chemical elements
what are living organisms composed of?
matter
what is matter?
anything that occupies space and has mass (weight)
what are the 3 states of matter?
solid, liquid, gas
what are the fundamental units of matter?
elements
what are elements?
elements are composed of atoms that are subdivided into subatomic particles
matter is composed of … elements
chemical
what is a substance that cannot be broken down to other substances?
an element
each element is represented by what?
letters
there are 6 elements that frequently occur in organic matter. what are those 6 elements?
carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulphur (CHNOP)
life requires how many essential elements? some of which are called..
life requires 25 essential elements, some of which are called trace elements