Little Harold overcame his fear of water after two bullies had held him under the water. Although he swam the rest of the season without noticeable fear, on the first day of swimming the next summer, he began to cry and said he was scared. What had occurred?

Cells are adapted to preform specific functions. which of the following terms refers to this capability?

Which statement about relative potential energy of electrons is correct? a. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 2 s orbital of the second electron shell. b. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 3 p orbital of the third electron shell. c. an electron in the 3 p orbital of the third electron shell has more potential energy than an electron in the 2 p orbital of the second electron shell.

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled