A. Cells have characteristic structures and functions that make them distinctive.
B. Processes in a cell can be classified broadly as growth, maintenance, reproduction, and homeostasis.
C. Life can be organized in a functional and structural hierarchy ranging from cells to the biosphere.
D. Most multicellular organisms are composed of organ systems whose structures reflect their particular function.
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This tutorial will help students to understand the process of reflex arc. A reflex arc is the nerve pathway which makes a fast, automatic response possible.When the safety of an organism demands a very quick response, the signals may be passed directly from a sensory neuron, via a relay neuron, to a motor neuron for instant, unthinking action. This is a reflex action.
Type: Tutorial