Apologia biology 2nd edition Module 16

amniotic egg

a shelled, water-retaining egg that allows reptile, bird, and certain mammal embryos to develop on land

neurotoxin

a poison that attacks the nervous system, causing blindness, paralysis, or suffocation

hemotoxin

a poison that attacks the red blood cells and blood vessels, destroying circulation

endotherm

an organism that is internally warmed by a heat-generating metabolic process

down feathers

feathers with smooth barbules but no hooked barbules

contour feathers

feathers with hooked and smooth barbules, allowing the barbules to interlock

placenta

a structure that allows an embryo to be nourished with the mother's blood supply

gestation

the period of time during which an embryo develops before being born

mammary glands

specialized organs in mammals that produce milk to nourish the young