Which indicator most likely suggests that a chemical change is taking place?

Biology

2 answers:

djverab [1.8K]3 years ago

8 0

Your answer is: A change in color.

notka56 [123]3 years ago

6 0

The following are the indicators that there are chemical changes that took place:

Formation of a gas
* When gas bubbles are formed it is often a sign that a chemical reaction is taking place.

Formation of heat and light together
*When heat and light are given off together it is often a sign that a chemical reaction is taking place.

Formation of a precipitate
*A precipitate is a solid that appears after two liquids are mixed together.

Color change

Temperature change

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Many species of gulls feed their chicks by regurgitating food. When parents return from foraging, the gull chicks peck at a red

makvit [3.9K]

Answer:

fixed action pattern, key stimulus; key stimulus, fixed action pattern

Explanation:

An innate behavior which specific to a species and is highly stereotyped is termed as a fixed action pattern.
This behavior occurs due to a neuronal network that is hard-wired in the species and the response is said to be generated following a key stimulus.
A key stimulus is the one that generates a fixed action pattern and this is also called a releaser.
A key stimulus can be in the form of shape, sound, color, or a combination of these.
In this case, the red spot is a stimulus for the chicks which causes them to peck at their parent's bill, and hence, the red spot is a key stimulus, and pecking of the chicks is a fixed action pattern.
The parents regurgitate the food only when the chicks peck at their bills, so pecking is a key stimulus for the parents which causes them to regurgitate the food which is a fixed action pattern.