Name the three fetal shunts. 

Drug tolerance refers to the

Nicotine consumption triggers an increase in

Normally, venous flow is from ______________________ to __________________ veins.

Amphetamines are to _____________ as opiates are to _________.

Which of the following characteristics provides a way to distinguish specific rock types from one another?

When a mineral is broken and has at least one smooth surface, it is said to have

Which type of atomic bond creates minerals that are highly conductive because electrons can move freely?

The lesser saphenous vein runs 

An increase in accident rates following the change to daylight saving time best illustrates the dangers of