The first known bird fossil date to the mesozoic era of time.
Explanation:
- The first known bird fossil is Archaeopteryx.
- Archaeopteryx were not exactly like modern birds and are called dinosaur like birds..
- Carbon dating suggest that these birds evolved during the jurassic period of mesozoic era.
- These are considered as the only birds of that era.
- Ancestors of modern birds began to evolve during cretaceous period and kept on evolving through Cenozoic era.
A) <span>The enzyme weakens chemical bonds in the substrate and catalyzes a change into the product. The enzyme itself remains unchanged. </span>
That is true, you limit on what you can do with them.
Because green house air is like carbon dioxide and is toxic for people to breathe in but they want to put it under an act that says it will cause u no harm
