<span>c. bacteria that could produce oxygen
</span>Which evolved during the Paleozoic Era?<u>bacteria that could produce oxygen
</u>
NOT:
a. earth’s first land plants
b. the first humans
<span>d. saber-toothed cats</span>
Answer:
The President is elected by members of an electoral college consisting of elected members of both Houses of Parliament and Legislative Assemblies of the states in accordance with the system of proportional representation, by means of single transferable vote.
Explanation:
In an era when NASA is led by an African American man (Administrator Charles Bolden<span>) and a woman (Deputy Administrator </span>Dava Newman<span>), when </span>recent NASA Center Directors<span> come from a variety of backgrounds, it's easy to overlook the people who paved the way for the agency's current robust and diverse workforce and leadership. Those who speak of NASA's pioneers rarely mention the name Dorothy Vaughan, but as the head of the NACA's segregated West Area Computing Unit, Vaughan was both a respected mathematician and NASA's first African-American manager. I learn this from class and from a book I hope this helps
</span>
Answer: Through trade with other countries
