what conclusion did the researchers from university of california san diego reach regarding the best type of material to use for beach nourishment?

a. boulders should be placed near the water's edge to prevent the current from taking the new sand out to the ocean.

b. sandy areas of a beach should alternate with cement areas to prevent erosion.

c. large, coarse grains of sand should be used since they remain on the beach longer.

d. sand mixed with soil should be used to promote plant growth and prevent erosion.

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.

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