What must a member obtain in order to speak at a meeting?

The right to speak.

Explanation:

With no other context than just this question, the right to speak is what someone needs to speak in a meeting with other persons.

This is something that is usually earned, the person willing to speak must be a respected individual, someone important within the organization having the meeting, or someone with something important to add to the conversation. Usually, during a business meeting, the only participants are the ones that make decisions, take leadership or have the right to give their opinion.

c. taught scientists many new things about the earth, but not other planets.

explanation:

d - failures.

the only attempted british colony in north america before 1600 was roanoke, virginia, which was a total failure. england claimed several areas, including newfoundland, but made no sustainable attempts to colonize them before 1600.