All of the ducks shown above are Mallard ducks that belong to the same species (Anas platyrhynchos). Based on these images, which of the following are species characteristics of the Mallard duck? A.
Mallard ducks have a green head and a yellow bill.
B.
Mallard ducks have a broad bill and feathers.
C.
Mallard ducks have a wingspan of exactly three feet.
D.
Mallard ducks are unable to stay afloat in water.

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

What is usually (but not always) related to the metabolic processes of living organisms in its organic form?

The ruiz family is exchanging euros for us dollars. the exchange rate is 1 euro equals 1.35261 usd. since the ruiz family knows that usd are stated to the nearest hundredth of a dollar, they used the conversion ratio