Why is it necessary to use the same restriction enzyme to cut 2 pieces of dna that are to be joined together

My question says on my assignment. read the following scenarios and decide which of the properties of life are being described. the first one is. katherine stopped on the way to school to grab some donuts. 2. because a dog cannot sweat, it has to pant in order to stay cool. 3. an elephant trun had no bone but 4,000 muscles. i have no idea what i am supposed to anwer. i can't find the answer in my notes or book that i can understand anyway

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat

Wich level of organization includes all the other levels or organizations