I would say, C. Because an controlled variable is an experimental element which is constant and unchanged throughout the course of the investigation.
What is the effect of taking the fruit from the birds...... on the environment
A true
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Answer:
The global food webs are the land and water food webs.
Explanation:
The global food webs are the land and water food webs. They are connected because food webs that begin on land will have organisms that will sometimes consume water organisms. ... Producers form the base of the food webs. Primary and secondary consumers make up the middle of the food webs (herbivores or omnivore
Animals either eat plants to obtain chemical energy in the form of glucose or they eat other animals that ate plants. Energy moves from the Sun to plants to animals. Photosynthesis is necessary for that energy flow.
