Sequence the steps in the process of how prions might be transmitted from cattle to humans

The correct answer is - through infected beef.

Explanation: Prions are the type of proteins that are misformed and can infect other proteins and transmit misfold or misform to normal proteins. These proteins can infect humans and animals like a cow.

In humans CJD and in cows it is known as mad cow disease. Abnormal prions are present in the infected animal's brain and spinal cord tissues. This can infect a normal tissue by getting a touch in the infected brain tissue during butchering and can contaminate the beef with prions and transmitted to humans who eat that infected beef.

Thus, the correct answer is - through infected beef.

50% lit on the left side

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.