True or false:

the genotype is the genetic makeup (known as alleles), while the phenotype is the outward expression of a trait (physical characteristic) that an organism has.

this is true

why do i need 20 characters?

they each offer a fresh glut of resources to the organisms that can arrive and exploit them. as individuals and new species continue to appear, they actively and passively alter the environment. competition for shared resources increases, local abiotic and biotic conditions shift, and the relative abundances of species change accordingly. the process is called ecological succession, and it is one of the earliest and most well-known concepts in ecology.