Natural selection involves changes in the genetic makeup of a population over a period of time. the random change of dna from parent to offspring, called mutations, can produce variations in offspring. some mutations can be , while others can be harmful. in this experiment, students modeled random mutations. data was collected to determine if the mutations were or harmful when trying to collect and eat food.

Arelationship where each person relies on the other; a give and take relationship

What is the role of institutions in society - do they perform positive functions, or simply work in the interests of the powerful and against the powerless? (a related question here is why do our life chances vary by class, gender and ethnicity)

Read the aphorisms. be slow in choosing a friend, slower in changing. an open foe may prove a curse; but a pretended friend is worse. a true friend is the best possession. according to these aphorisms from benjamin franklin's poor richard's almanack, what might happen if a person is careless in choosing a friend? it is best not to have friends because they will usually betray you. casual friends are often the best and can be more trusted than enemies. a person who has betrayed you can sometimes become a good friend. a friend who is not carefully chosen can be worse than an enemy.