When a dairy farmer chooses to breed the cows that give the most milk in the herd, the farmers are following the principle of
a. artificial selection.
b. natural selection.
c. descent with modification.
d. acquired characteristics.

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

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

Choose one animal (cheetas) and research on the internet what has contributed to this animal becoming "endangered" or "threatened." what animal you have chosen? how long has the animal been endangered or threatened? what has contributed to this animal’s endangered or threatened status? why is it important to save this animal from extinction? after researching and gathering facts, write a 350-word letter from the point of view of an animal rights' activist. be sure to include at least five facts that you learned from your research.