29. which of the following best describes animal
species that function as a “keystone” (line 35)?
a. they are a major factor in disease
prevention.
b. they are a food source for other animals.
c. they pollinate every plant species.
d. they are crucial in maintaining the
balance of their ecosystem.
e. they generate the oxygen in the
atmosphere.

im pretty sure a would be the answer

i believe being nice to m family is the right thing to do. they are people too and the deserve the same respect i have. they are there for me when i need them. i believe i should always put my family first because that is just how life is suppose to be. i love each and every member of my family and i should respect and act like i do. i believe that being nice to your family makes it easier for them to be nice to you. thats why i believe what i do.

brainliest ! ? ☺