Answer: Cells of an organism tell each other when predators are near.
Explanation:
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Endorphins are natural opiates released in response to pain and exercise. drugs and other chemicals affect brain chemistry at synapses. agonists
The western toad belongs to the large toad specie. It is between 2.2 inches to 5.1 inches long. Its scientific name is Anaxyrus boreas. Its dorsal stripe is either white or cream in color. It has no cranial crest. Skin color is either greenish or dusky gray. A distinguishing feature are the oval parotoid glands found behind the eyes. The western toad can be found in desert streams and springs, wet or dry mountain meadows and ponds or open water for breeding.
Geographical isolation (vicariance) is the main reason for the evolution of either side mouse into new species.
What is geographical isolation?
Two populations of the same species are geographically separated by a barrier, they will eventually become genetically distinct from one another. Even when they are exposed to the same kinds of environmental selection forces and are living in the same region, two populations of the same species can yet become genetically distinct from one another.
A new river cuts through a land mass, separating populations of mice on either side. these mice then evolve into new species on the two sides of the land mass, the separation of a group of organisms by a geographic barrier, resulting in the differentiation of the original group into new varieties or species.
Hence, vicariance is a kind of evolution caused by geographical isolation.
To learn more about the geographical isolation and vicariance the link is given below:
brainly.com/question/9601840?
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Answer:
y = -1/2x - 1
Explanation:
Slope-Intercept Form: y = mx + b
Slope Formula: 
Step 1: Define
(2, -2) random points
(0, -1) y-intercept
Step 2: Find slope <em>m</em>
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y = -1/2x + b
Step 3: Write linear equation
y = -1/2x - 1
