<span>In cells, enzymes are proteins that are needed to lower the amount of energy required to start chemical.</span>
Enzymes are biological catalysts which accelerate chemical reactions (reactions are millions of times faster than without them). Every enzyme has an active site which binds substrates and converts them into products.
Answer:
The periosteum is one source of precursor cells which develop into chondroblasts and osteoblasts that are essential to the healing of bone. Other sources of precursor cells are the bone marrow (when present), endosteum, small blood vessels, and fibroblasts.
Answer:
<em>The correct option is d) mammals</em>
Explanation:
Studies made by scientists have shown that mammals are nor able to evolve fast enough as compared to other groups of animals. As a result, mammals tend to become more extinct as compared to organisms of the groups. Many mass extinctions of mammal organisms have been recorded over the past 400 years. The mammalian organisms possess little biodiversity in them as compared to organisms of the other phyla.
