What is the first event in human development? implantation pregnancy gastrulation fertilization

How does a gymnosperm prevent itself from pollinating the same tree

Astudent reads the following text in a science book: scientific evidence tells us that the cause of earths four seasons is the tilt of earth as it revolves around the sound the student is instructed to illustrate this information in a science book. how will the student illustrate winter in the northern hemisphere? a.earths northern hemisphere will tilt away from the sun. b. earths northern hemisphere will tilt toward the sun. c.earths orbit will be farther away than from the sun d. earths southern hemisphere will tilt away from the sun.

Hurry where is the majority of earth's water found? o glaciers o oceans ground o rivers and lakes