Which factors improve soil fertility? select three answers

a: humus

b: bedrock

c: horizons

d: nitrogen

e: manure

Describe five factors that influence the value of fuel

Amylase becomes denatured at a temperature of 80°c. during an experiment to study the effect of varyingtemperature on enzyme activity, amylase’s reactivity with starch was measured at body temperature (37°c), andthen again at an increased temperature of 42°c. how would this increase in temperature affect the experiment

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?