Which of the following is a way humans use trees?
a. paper
b. food
c. wood
d. all of the above

d. all of the above

Trees are one of the vital resources that humans and other organisms need. They serve for shelter, food, safety against natural disasters -even prevents them, provides oxygen and other simple physiological needs.However, they also cater and provide more complex human needs.  

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the