Plants, animals, yeast, and bacteria all share very similar cell-signaling processes. Which of the following does this suggest about the evolution of cell communication in organisms?

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

In which situations is the principle of cross-cutting relationship useful in determining relative age?

Me with these questions image attached