Answer:
C
Explanation:
A. Since
B. Because
C. Although
D. For example
<em>Zebra mussels have been known to have a lifespan of six or seven years in the past but recent discoveries have shown that their average lifespan now ranges between one to two years. Hence, the correct word to fill in the gap would be 'Although'. </em>
<em>The correct option is C</em>
Ozone protects the Earth from harmful UV rays from the Sun.
Organisms that produce their own energy or "food" are known as autotrophs.
Answer:
Stomata takes in water,sunlight,and dioxide and release oxygen.