Will give a brainlest the use of machinery and fossil fuels has changed agriculture in the united states. how has the amount of oil used to produce 1 ton of grain changed over a 35-year period? it has been reduced by one-half. it has doubled. it has stayed the same. it is three times as much.

It has doubled.

With the advent of technology, the use of fossil fuels has also being increased , which is utilized as a fuel fro providing energy. The increase in population has increased the demands for food, therefore, has increased the burden over the agricultural practices to meet the needs of the growing population. Hence, in the present era the amount of oil used to produce 1 ton of grain changed over a 35-year period has doubled.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.

the answer is c.mitochondria. glad to .