Identify the examples in which sam interacts only with natural resources.
sam woke up at 7: 00 a. m. he threw off his cotton sheets and started to get ready for the day. he went to the bathroom and brushed his teeth.
he took a deep breath and splashed some water on his face. he walked into the kitchen and located a plastic bowl. he grabbed some cereal
from the pantry and a gallon of milk from the refrigerator. sam ate his breakfast in the living room while watching television.

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)