Which is the correct definition of tissues?
a.
the name for the developing organism from fertilization to about the eighth week of development.
b.
groups of similar cells that do a particular job.
c.
the basic units of heredity.
d.
threadlike structures that carry the codes for inherited traits.

You have trained year for a marathon. in your first attempt to run a marathon, you decide that you want to complete this 26-mile race in 4-5 hours. a. what is the length of a marathon in kilometers (1mile= 1.6 kilometers). b. what would your average speed have to be to complete the race 4.5 hours? give your answer in kilometers per hour.