D. <span>controlled
is the right answer because a</span><span>n </span>experiment<span> in which an observer tests a hypothesis by looking for changes carried by alterations to a variable.</span>
One cell can be very helpful to a factory.
Answer:
There are many changes that is ongoing on the earth. Some of the changes are short term changes and the others are long term changes.
These changes are due to the effect of human activities or due to natural processes.
The life of organism depends on these geological processes that keeps on going with time. The growth and development of the organism is hampered by these processes.
Change is the rule of nature and it keeps on changing with time. There has been 5 massive mass extinctions which has affected the life of plant and animal species.
Many of the species have been extincted due to this process.
False. Energy is only released when chemical bonds are formed.
