Answer:
Nucleus
Explanation:
I know this I've learnt it just today lol. Red Blood Cells don't have a nucleus.
Answer:
#1 false its difficult but also possible. #2 true and #3 False. the Salivary gland in the mouth make 1.5 liters a day
An ectotherm gets its heat from external sources
(Remember "ecto" means outer, "endo" means inner)
Answer:
It heats the Earth unevenly, creating warm spots and cool spots
Answer:
rise over run
Explanation:
rise refers to the number of units going u or down a graph
run refers to the number of units going left or right
it is seen as so;
,
, or 
Don't panic when I included "delta". Delta, it refers/means the small mathematical triangle found beside the rise and run symbols of y and x