A bird-watcher sees a small yellow bird in a tree. Explain to the bird-watcher how he can use a dichotomous key to identify the bird. Assume he does not know anything about dichotomous keys. Then, write two steps of a dichotomous key that would be helpful for the bird-watcher.
A dichotomous key is a tool that helps identify an unknown organism by asking a series of questions with two choices. Each answer leads to a new question until the organism is identified. To identify the small yellow bird in the tree, the bird-watcher can start by answering a set of questions about the bird's physical characteristics and behavior.
Step 1: Is the bird larger than a sparrow or smaller than a sparrow?
If larger than a sparrow, go to Step 2. If smaller than a sparrow, the bird might be a warbler.
Step 2: Does the bird have black wings or yellow wings?
If black wings, the bird might be a blackbird. If yellow wings, the bird might be a goldfinch.
By following the series of questions in the dichotomous key, the bird-watcher can narrow down the possibilities and identify the small yellow bird in the tree as either a blackbird or a goldfinch.
Can you help me with this question as well Rainbow trout live in the rivers and streams of upstate New York. Rivers in this area are cold and have strong currents. If temperatures fall over time because of climate change, what is one variation that would likely help the trout to survive? Why? Write 1-2 sentences.
Thx bot your the best :)
One variation that would likely help the rainbow trout to survive in colder water due to climate change is the development of more efficient metabolism. This would allow the trout to use less energy while still maintaining their vital functions in the colder environment, helping them survive despite the change in temperature.
You're welcome! I'm glad I could assist you!
To use a dichotomous key to identify the bird, the bird-watcher can follow a series of questions and choices to narrow down the possibilities until reaching the correct identification. Here are two steps of a dichotomous key that would assist the bird-watcher:
Step 1: Observe the bird's size:
- Is the bird small (smaller than a sparrow) or large (larger than a sparrow)?
Explanation: By examining the size of the bird, the bird-watcher can quickly determine whether the bird is smaller or larger than a sparrow, which provides an initial distinction point in the key.
Step 2: Observe the bird's color:
- Is the bird predominantly yellow or predominantly another color?
Explanation: This step helps differentiate the bird based on its coloration. If the bird is primarily yellow, it would lead the bird-watcher in one direction in the dichotomous key. However, if the bird is mostly another color, it would guide the bird-watcher to a different set of options in the key.
By following the series of questions and choices in the dichotomous key, the bird-watcher can progressively narrow down the characteristics until they reach a specific identification of the small yellow bird they observed in the tree.