Heat and cold treatment of food products is practiced since time immemorial for food preservation. how does it prevent food spoilage ?

If someone could do the first couple, just so i can see how it's done that would be great! 20 points. complete a dichotomous key for the 10 leaves on the common leaves sheet. the chart provided here allows for 11 pairs of statements. depending on how you build your dichotomous key, you may or may not need all of them, or you may need to add some.

The deserts of the sahara and australia are associated with

Construct an explanation about the function of mitosis for multicellular organisms