Two of these answers

Osteoporosis

Muscle spasms

Reduced blood-oxygen carrying capacity

Increased blood-oxygen carrying capacity

Cells may induce neighboring cells to differentiate

The process of neurulation follows gastrulation

The eye develops early in vertebrate morphogenesis

Cell differentiation is an all-or-nothing phenomenon

Female-to-male sexual differentiation in the fetus

Erythropoiesis in the fetus

Maternal satiation hormone

Positive feedback to promote fetal growth hormones

Negative feedback to inhibit menstrual cycle