The specific name for the two branches of the trachea that enter the lungs is

The study of interaction between living organisms and their enviroment is called (a) phytogeography (b) ecology (c) phytosociology (d) ecosystem

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

Graphs you see question 5 options: the change in data over time the relationship between different dependent variables the relationship between the independent variable and the dependent variable/s the relationship between different independent variables