Answer:
Study genetics
Explanation:
The peas that Mendel used for his studies were easy to obtain and inexpensive materials. I carry out experiments on genetics with them, crossing two pea plants (yellow and green), thus allowing us to observe their characters, dominant or recessive. Thus he could state the three laws: 1st (uniformity), 2nd (segregation principle) and 3rd (independent combination).
If the population/number of the things they need decrease, so will the number of the organism
