Two groups of related living things are no longer considered to be the same species when a. They can no longer interbreed.
b. They do not eat the same food.
c. They do not look the same.
d. They become physically separated from each other.

(it's not mathematics, i just put that subject so more ppl see it so pls answer this!!)

A

Step-by-step explanation:

i used to know how to do this in 7th but i forget easily

step-by-step explanation:

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x