Joseph uses classical conditioning to teach his sister to be afraid of squirrels. To be successful, he must pair the neutral stimulus, the squirrel, with a(n) , such as .

Explanation:

Such type of stimulus that is trigger by the neutral in nature is called a conditioned stimulus such as the sound of the bell and some other. Such type of stimulus that is biologically potent is called an unconditional stimulus such as the taste of food and some other things. When the biologically effective stimulus is used with neutral stimulus then the classical conditions are formed that are used in the learning process.

the answer is yes, they are born/created, then they grow to their limit then produce offspring, then die.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.