Answer: Wind energy can harm migrating birds.
Explanation: Cost doesn't make it controversial, and the first two make me laugh!
Answer:
Waxing gibbous moon.
Explanation:
Waxing gibbous moon is called the lunar phase that occurs between the middle of the first quarter and the full moon, that is, when the sunlight covers more than 50% of the visible lunar surface but less than 100% of it. Thus, it is the fourth phase of the moon, within the crescent half of the cycle of said celestial body.
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A group of cells working together are called tissues. Organisms are made up of this structure. Cells are the smallest unit of life. A group of tissues working together is called organ. A group of organs working together is called organ system. An organ system working together makes up an organism.
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An independent variable that is manipulated means to achieve a particular effect or tested to determine if it is the cause of the effect.
For example, to find out if your weight depends on the amount of calories you consume, you could lower your caloric intake (calories is the manipulated variable) for a period of time and see how your weight changes in response.