in an ecosystem, there are two color varieties within a species of toads: brown and green. over 50 years, the proportion of the population that is green increases from 20% to 50%. which statement is the most likely to explain this change? (1 point) pollution caused a decrease in the proportion of brown toads. the environment changed such that toads that can jump higher into the trees to survive better. the environment changed such that green toads can blend into their surroundings better. a disease

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.