A store sells memory cards for $25 each. A) The markup for each memory card is 25. How much did the store pay for 50 memory cards? B) The store offers a discount when a customer buys 2 or more memory cards. A customer pays $47.50 for two memory cards. What is the percent of discount? C) How much does a customer pay for three memory cards if the store increases the percent of discount in part b by 2%? Please help! (explination as well please!) :)​

the answer is; biodiversity resulting from few ancestors

adaptive radiation occurs when a population is subjected to a large natural environment with spatial ecological variations. the parts of the population in the different ecologies begin to adapt to their local environments. due to non-random mating across the large populations, this causes the different populations from the large population to speciate within their local environments. they, therefore, diverge to different species sharing a common ancestor.  

i don't know

step-by-step explanation:

is the anwser b. (-13)?