Which two observations led darwin to conclude that there is competition for survival?

Who gave the famous "i have a dream" speech at the march on washington?

Read the scenario. samira is a freshman basketball player who hopes to go to college on a basketball scholarship. she is offered the chance to play on her school’s varsity basketball team, which plays in tournaments during holiday breaks. samira usually spends her breaks working at the local hardware store. after careful consideration, samira decides to stay on the freshman basketball team and keep working over breaks. the fact that samira may miss out on a scholarship opportunity by staying on the freshman team illustrates-a cause.-minor consequences.-a trade off.-unexpected risk.

What is the rule relating the ratio of marginal utility to prices of two goods at the optimal choice? explain why, if this rule does not hold, the choice cannot be utility-maximizing.