Why is the ratio of male to female births roughly 50:50? help me please!!! a) All egg cells carry an X chromosome.
b) All sperm cells carry an X chromosome.
c) Half of all egg cells carry a Y chromosome.
d) Half of all sperm cells carry a Y chromosome.

This is because of how reproduction works in humans. Male and female sex cells are formed by a process called meiosis, where the diploid chromosomes divide and separate. And so the ratio of male to female births is also 50:50.

[ answer ]

foliated

[ explanation ]

foliation forms in a rock when pressure squeezes the rock together. the rock then has a design of many different color little lines. there are three types of foliated rock. the types are slate, schist, and gneiss. each type of foliated rock is different based on grain size and foliation characteristics. the lines appear when the rock has been under pressure.

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