Which of the following is a chemical defense of plants? A.) Macrophages

B.) Helper T cells

C.) Thorns

D.) Toxins that kill the predator.

Describe five factors that influence the value of fuel

Hey me with this one❤❤❤❤ every organism needs food. does a cell also need it? explain very briefly.

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.