A+a+3b+b (simply the expression by combining like terms)
Please help me!:) and show the steps if you can!<3

2a + 4b

Step-by-step explanation:

Its not hard, you just need to add all the numbers with the same variable together, such as 3b and b. They stay in the same place as the first one with the variable is at. a + a would not make it 1a it would be 2a because there are 2 A's.

Hope it helps

the answer is; biodiversity resulting from few ancestors

adaptive radiation occurs when a population is subjected to a large natural environment with spatial ecological variations. the parts of the population in the different ecologies begin to adapt to their local environments. due to non-random mating across the large populations, this causes the different populations from the large population to speciate within their local environments. they, therefore, diverge to different species sharing a common ancestor.