Which mammal does not give live birth whale sea cow duck-billed platypus kangaroo dog

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

Plants that have reproductive structures called cones are?

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c. ozone layer hole d. increase in sea levels