Soil reaction is
a. the measure of the acidity or alkalinity of soil
b. the highest amount of cations soil can absorb
c. determined by the types of minerals in the soil
d. the layering of soil into horizons

Why can't you grow plants with adhesion water?

Consider darwin's first writings on the theory of natural selection. an important point of darwin's essay on the principle of population, written in 1798, was a peer's observation that in nature plants and animals produce far more offspring than can survive, this observation can be attributed to a) charles lyell. b) thomas malthus. c) jean-baptiste lamarck. d) johann friedrich meckel.

Which best describes a benefit of using dna technology in medicine? a) medicine can be produced in mass quantities. b) medicine can be distributed at a reduced cost. c) medicines have fewer side effects. d) medicines are resistant to antibiotics.