This science is called anthropology
The severity of the tradeoff between parental care and other activities may depend on environmental conditions. For example, if there is a lot of food available, parents may spend more time tending their young because finding food for themselves takes less time and energy. (Hoping that helps)
The answer to your question is ( Blastocyst formation) takes place last.
Astronomy can best be described as a "<span>a. study of objects beyond earths atmosphere", although the subject of astronomy can be much more complicated. </span>
