2 Chemical Reactions BEFORE YOU READ
On the lines below, explain why you think rust forms on metal.
Then read the section to learn the role of chemical reactions in
living things.

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.