A train travels 72 km, north along a straight track in 28 minutes. What is the train's average velocity in kilometers per minutes?

15 ! come and answer! a(n) is the general term for an infectious disease that has spread across a city, region, or country.

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.)chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?