In order to double the wavelength of a wave, 1. the amplitude should be doubled.

2. the frequency should be doubled.

3. the frequency should be halved.

4. the amplitude should be halved.

The study of interaction between living organisms and their enviroment is called (a) phytogeography (b) ecology (c) phytosociology (d) ecosystem

Creation of an unnaturally uniform sample to represent a diverse populationcan be avoided by: a. including only willing b. asking another scientist for .c. choosing only identical participants.d. selecting individuals at random.

Environmental impacts on evolution : mastery test