What factors can be be biotic and abiotic. How so?

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.

Ais a landform that is formed at the mouth of a river from the deposition of sediment carried by the river as the water flows.

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million