Activation energy is the amount of energy required to initiate a chemical reaction. The activation energy can be determined from reaction rate constants at different temperatures by the equation. ln(k 2 /k 1) = E a /R x (1/T 1 - 1/T 2).
Robins eat different types of food depending not only on the time of year, but even time of day. They eat earthworms early in the day and more fruit later in the day. Because they forage largely on lawns, they are vulnerable to pesticide poisoning and can be an important indicator of chemical pollution.
A. The main predators of robin eggs are snakes, squirrels, blue jays, and crows. (Deer eat a lot of bird eggs and nestlings, too, but only from ground nests.) Snakes swallow eggs on the spot, and since you found one egg in another part of the yard, a snake most certainly wasn't the culprit.