A class observes a mother bear and her cubs in the river. She is helping her cubs to survive. How is the mother helping her cubs survive? A. She is teaching them how to swim, B. She is teaching them how to get clean. be C. She is teaching th th how to catch food, D. She is teaching them where to find water.

Sydney drew a flow chart to illustrate the nitrogen cycle.which labels best complete the flow chart? x: producers undergo photosynthesis.y: nitrogen compounds are released into the air.x: nitrogen compounds are released into the air.y: producers undergo photosynthesis.x: free nitrogen is in the atmosphere.y: producers absorb nitrogen compounds through their roots.x: producers absorb nitrogen compounds through their roots.y: free nitrogen is in the atmosphere.

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

Is there any solid scientific evidence that humans have been cloned?