The flowers of the snow buttercup face one direction in the moring move throughut the day and face the other way by eveing. Most likey this is a reasopns to which stimulus

Sun that passes through the sky

Explanation:

A stimulus is anything that provokes an organism to react in a certain way.

Consider the following example:

The flowers of the snow buttercup face one direction in the morning and face the other way by evening. Most likely this is a response to the Sun that passes through the sky.

So, here the stimulus is the Sun.

acid rain is the answer

the invasive species was introduced due to commercial purpouses, as there was a demand for fur clothes and hence, a business opportunity connected to this product. actually, it was when the nutrias scaped, causing harm to the us ecosystems when they acquired the status of invasive species. in this case they have caused an environmental problem, but it could have affected also economic interests or even human health.