What does it mean when a 15-16 year old girl has blood coming from her poop?​

Which of the following are examples of coordinate headings

During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4

Marcus's genotype for eye color is bb. olivia has brown eyes, but she is heterozygous for the trait. what percentage of the children have blue eyes? if violet has green eyes and jonas has brown eyes, what is claudia's genotype? how many people in the family have blue eyes?