True or false. the green revolution is the development of high-yield varieties of crops and the use of modern cultivation methods, including the use of farm machinery, fertilizers, pesticides, and irrigation.

True

Explanation:

The green revolution started in 1960s and it introduced the following into the agricultural system -

a) High yielding varieties of seed

b) Efficient irrigation practices

c) Use of specific fertilizers

d) Introduction to use of pesticides/weedicides to protect the crop

e) Enhancement of commercial farming through use of modern equipment's such as tractor, drills , harvester etc.

Hence, the given statement is true.

amber has allowed scientists to study dna that has been preserved over millions of years.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.