Answer:
Organ is a unit/group of tissues (structurally) that performs a basic function while organ system is a group of various organs that together helps in certain biological processes (must for one's survival).
Answer:
is b casue the other are like what they do but bear to sleep takes a long time to evole into doing that
Explanation:
In mammals urine is expelled through the urethra which is part of the excretory system in unicellular organisms waste products are discharged directly through the surface of the cell
1. Biologists, just like astronomers examine past data to determine what was and what is likely to be, they both look back in time. Biologists study fossil records, and astronomers use the telescope to study galaxies.
2. Both biologists and astronomers seek to understand and appreciate life, for the biologist here on earth, and for astronomers in space.
3. There is uncertainty on both sides about the future evolution of the universe. What guides them is the past, and none is sure of the future evolution.
