For whelks sea snails one of the factors they must consider

For whelks (sea snails), one of the factors they must consider when selecting a habitat to live in is the size of that habitat. The graph below shows the survival rate for whelks after 600 days based on the size of their habitat. Each habitat started with the same number of whelks on day 0. The size of the habitats tested were in m^-2. For example, the whelks in the pink data set were on a habitat size of 1 m^-2, and the whelks in the brown data set were on a habitat size of 1/64 m^-2. What was the minimal sized habitat tested that allowed at least 80% of the initial whelks to survive by 600 days? 1 m^-2 1/16 m^-2 1/64 m^-2 1/32 m^-2 1/8 m^-2 1/2 m^-2 1/4 m^-2

Solution

Answer: As evident from graph that 1/4 m^-2 is the minimal size habitat tested that allowed at least 80% of the initial whelks to survive by 600 days.Habitat smaller than 1/4 m^-2 show surviving population less than 80% by 600 days.