I believe the answer is B
Answer:
There is a great deal of diversity in life on Earth because the planet has so many different climates that life has adapted to and colonized.
Explanation:
Unlike humans, plants don't contain bones. Because of this, they have a cell wall to provide structure and protect their organs.
A catalyst : speeds up a reaction.
Answer:
increasing growth and decreasing rate of growth
Explanation:
Global population growth slowing due to greater longevity and lower fertility rates. The world's population is getting older and growing at a slower pace but is still expected to increase from 7.7 billion currently to 9.7 billion in 2050