Question

multiple select question
select all that apply
select all the characteristics of birds.
four - chambered heart
different types of teeth
lay amniotic eggs
feathers
females form a placenta to nourish developing young
endothermic
reproduction is tied to water

Explanation:

Birds have a four - chambered heart, lay amniotic eggs, have feathers, and are endothermic. They do not have different types of teeth (they have a beak instead), females do not form a placenta (placenta is a characteristic of most mammals), and their reproduction is not tied to water (unlike some amphibians).

Answer:

four - chambered heart, lay amniotic eggs, feathers, endothermic.