Which vertebrates have air sacs attached to their lungs that make the lungs more efficient?

Some technological solutions to problems like global warming meet the specific needs and situations of local communities. an example from india involves converting the solid waste from cattle into clean-burning fuel for cooking. this reduces the amount of greenhouse gases, specifically methane and carbon dioxide, released into the environment from wood fires. when evaluating the feasibility of implementing this solution, computer models are used to weigh costs against benefits. what factor is least likely to impact the decision on adopting this technology?

This is a scaffolding of protein fibers that us sell keep it shape in a cell division and cell movement

This is a biological reaction due to a stimulus. i need this quickly !