Three structural changes that occur in young unmodified plant cells as they develop into xylem tissues

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

Which could be a pathway of food through an ecosystem

Why does the earth spin slowly, not faster? is it possible to prove it scientifically? can you prove it with math?