Small, incremental changes over numerous generations is the model of speciation described by Darwin and is known as

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.

Which statement about the immune system is false? a. lymphocytes reduce inflammation, b. b cells remember specific pathogens. c. most white blood cells kill bacteria d. white blood cells are made in lymph nodes.

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?