When scientists set out to test a hypothesis, it is often most practical to try to prove the hypothesis false rather than to prove it is true in all cases. scientists place great confidence in cell theory, yet it has not been tested in every living thing on the planet. what piece of evidence would cause scientists to decide that cell theory would need to be revised? a. an organism was found with tissues made of something other than cells. b. a cell was found that could continue to divide and reproduce indefinitely. c. an animal cell was found that could harness solar energy as plant cells do. d. cells were found that used something other than dna as hereditary material.

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.