45. What is known as the smallest particle of an element ? a. Monomer
b. Atom
c. Carbohydrate

bc blah

explanation:

bc blah

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.