permanent teeth eruption in children generally starts at the
age of
a. 6 months
b. 6 years
c. 2 years
. 12 years

Which of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.

Human genes only differ by less than percent. a. 1 b. 6 c. 11 d. 16