Ellen grabs a topsoil sample in her hand. she rolls it into a ball. the soil feels gritty and the ball falls apart. what part of the topsoil most likely made the topsoil feel gritty? a-clay b-sand c-silt d-humus

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.