What is the BEST description of the beginning of secondary succession? (a)Soil is already present.
(b)It begins on rock formations.
(c)Plants are already present.
(d)Pioneer species appear.

Amniocentesis is a process in which amniotic fluid is taken from the mother's womb to identify any genetic abnormalities in the fetus. how would the discovery of the human genome contribute to this process?

The eruption of a nearby volcano causes a prairie ecosystem to receive a lot less sunlight. which of these is most likely effect on the ecosystem?

The importance of the mind as a part of the body is an example of: