What are the smaller branched tubes that connect the arteries and veins called?

What is the first step in a life cycle of a plant reproduce sexually

Rank the three variables in terms of how strongly they affect the "species" composition of the bacterial communities. place the variable with the weakest effect on the left and the variable with the strongest effect on the right.

Ascientist and her team counted 200 individual deer in an area of 10 square kilometers. what is the population density?