What happens when the heart muscles are damaged due to lack of blood supply?
a. choking
b. heart attack
c. slurred speech
d. stroke

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million

The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping