Why are biologists still debating the classification of protozoans?
a. biologists never agree on anything
b. there are estimated to be over 50,000 different species
c. protozoans can be heterotrophic or autotrophic
d. protozoans can be unicellular or multicellular

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.

c. is the correct answer

it is because according to the process , scientific inquiry is a process with many steps because each step occurs to the scientist and if you just skip a step there would be no steps to scientific inquiry.