during active, transport, substance move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is active because it requires the use of energy. <em>It</em> <em>is</em><em> </em><em>t</em><em>he</em><em> </em><em>opp</em><em>osite</em><em> </em><em>of</em><em> </em><em>passive</em><em> </em><em>trans</em><em>port</em><em>.</em>
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it is two forces are unequal or unbalance
Answer:
The correct answer is option B. "needs, wants".
Explanation:
Needs are basic human requirements, which include the basics needs of food, shelter and clothing. On the other hand, wants are the ways in which needs are satisfied. For instance, the need of food is satisfied by the wants of different types of food, depending on cultural and socioeconomic factors.
The food chain ?
Sun
Primary producers
Primary consumers
Secondary consumers
Tertiary consumers