"the human body. it is an organism. it is made up of cells, tissues, organs, and organ systems," said ms. garcia to her students. "i can see tissues, my skin! " said allie. "but how do i know i am made of cells too? " the students carried out an experiment to prove to allie that they were indeed made of cells. here is a photo of their lab activity. what did they do?

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?

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When you run, you begin to breathe heavier and faster. your heart beats more quickly, bringing more oxygen to your cells. which organ systems are working together here?