The amount of time that passes between the fertilization and the first division of zygote is estimated to be <u>2</u><u>4</u><u> </u><u>h</u><u>o</u><u>u</u><u>r</u><u>s</u><u>.</u>
The integumentary system is composed of skin and other appendices such as nails and hairs. In the integumentary system there are several connections with the endocrine system.
Your circulatory and respiratory systems
The answer to number 9 is d
