The constant inward movement of oxygen into most cells is primarily due to: a. primary active transport

b. secondary active transport

c. facilitated diffusion using carrier proteins

d. simple diffusion across the phospholipid bilayer

e. simple diffusion through channels

true                                                                                                       true true true true true true

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.

garbage disposal because lysosomes dispose of old cell parts like garbage disposals dispose of old food.