Answer:
(4) tissues
Explanation:
There are three circles the innermost circle indicated the cells middle circle is the tissues and the outermost circle indicated the organs. Multicellular organisms are made up of thousands of different types of cells .Different cells constitute together forma a tissues and different tissues form a organ and different organs together form an organ system. Hence the X labeled circle denotes the tissues.
Regretfully, you have not included in the question, the choices that would be our guide to arriving in the answer to this query. However, as a general knowledge, the acidity of a substance can be measured by its pH which is equal to,
pH = -log[H+]
which means that the increase in H+ ions will lead to the decrease in pH. A smaller pH value denotes that the substance is more acidic.
A. Plants
They are not an example abiotic factor
