What occurs if the environment changes and a species is no longer able to survive.

Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte

Which is an example of a vestigial structure? a. tail of a monkey b. fin of a fish c. flower of a plant d. tailbone of a human

Why does the earth spin slowly, not faster? is it possible to prove it scientifically? can you prove it with math?