The heart pumps harder and blood pressure rises during a fight-or-flight response. this response is due to
a. thyroxine secreted by the thyroid gland.
b. adrenaline secreted by the adrenal glands.
c. insulin secreted by the pancreas.
d. oxytocin secreted by the pituitary gland.

Which organism is the producer in this food web? 7th grade question. a) arthropods b) birds c) fungi d) plants

How many years would it take the atlantic ocean to grow 500 centimeters? show your work.

Pentane with molecular formula c5h12, exists in three isomeric forms. one shows linear carbon chains, another has one -ch3 groups present on the third carbon atom, and the third has two -ch3 groups present on the second carbon atom. what types of isomers are these? a. geometric isomers b. structural isomers c. halotropic isomers