I believe studying the hydrosphere would be most important because we haven't explored a good majority of it yet so we need to explore our waters before we explore space
The eggs will have 5 chromosomes and the sperm would have 5 chromosomes because when they combine, they equal to a total of 10 chromosomes.
Axis, earth, new, moon, half, moon, full, eclipse, lunar. Your welcome
The answer is d. Food chain