Need help on my science question is from savvas pls help me on this my due time is ab to end

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

Milk production during breastfeeding is increased by the suckling of a newborn from his mother's nipple. this type of feedback mechanism best describes a positive or negative