Amammal who is young develop inside the mother is known as a

Oviparous animals develop inside the egg while inside the mother's body.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

yes, because even though a theory has a  lot of evidence to support it, it is not always true