Response to the first question (I don't quite know how to explain the second): (Here's my simple version, just based off of common sense and background knowledge rather than a textbook. Hope it works!)
Gender is determined by the X and Y chromosomes. Females are XX, males are XY. Since there is already a ratio of 3:1 X:Y chromosomes, meaning that there are many more X chromosomes than Y chromosomes, it is more likely for the child to be female, because they are more likely to get two X chromosomes.
Explanation/Answer :Blood moves continuously through the body, delivering oxygen and other materials to cells and removing carbon dioxide and other wastes from cells.
Correct me if I'm wrong but I'm pretty sure it is B.
Answer:
It is circulatory system and the digestive system.
Explanation:
