1-a species of marine snails have either solid or striped shells. scientists found that 57 percent of the snail population was striped, and 33 percent was solid. sea birds are the main predator and when scientists studied their diet, they found that the birds ate more striped snails than solid snails. what could scientists conclude about the snails? birds preferred the solid snails. rates of predation determine shell pattern. the shell pattern is due only to environmental variation. there may be other factors in the ecosystem that favor striped snails. question 4(multiple choice worth 3 points) 2- in 1989, the exxon valdez spilled nearly 42,000,000 liters of oil into prince william sound, alaska. how would this spill be classified? abiotic environmental biotic environmental genetic pathogenic

1. The correct answer would be "There may be other factors in the ecosystem that favor striped snails".

Solid snails are less hunted by sea birds as compared to the stripped snails. Therefore, we can conclude that the solid snail provides some kind of survival advantage to the population.

However, the percentage of solid snails as low as 33 percent. Thus, there must be some other environmental factors which favor the high percentage of striped snails.  

2. The correct answer would be abiotic environmental.

In ecology, the abiotic component refers to the non-living component of the environment. For example, air, water, mountains, soil, minerals et cetera.

Similarly, oil being a chemical is a non-living thing.

Thus, it is an abiotic environmental factor.

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

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