Human systems one of the six essential elements for geography could be compared to human environment interaction's two of the five themes of geography

The answers are/ (b) climate refers to long term atmospheric,conditions weather refers to short term.

1. which type of clouds can you always expect to signal fair weather: cirrus, stratus, or cumulus?
stratus 

2. which type of clouds can you always expect to bring precipitation: alto, nimbus, or cumulus?  
nimbus 

3. list these clouds from highest to lowest: cirrus, stratus, fog, altocumulus. 
citrus,  altocumulus, stratus, fog 

4. which type of cloud occasionally produces precipitation: stratus, short cumulus, or cirrocumulus?
short cumulus.

Iam pretty sure that the answer is either a. -  it would the ecosystem become more stable. or it is d. -  the larger number of species would make the ecosystem more prone to disease.. 
i would go with d.
i hope this you!
have a nice day!

The correct answer is letter d. scientists think that convection currents flow in earth's inner core. this then causes the movement of tectonic plates which causes shifts in topographies of different locations. convection currents also have the tendency to transfer heat to the surface of the earth which causes magma to spill out from openings of volcanoes.