Cell division is preceded by two growth phases. besides growth, both g1 and g2
a) contain checkpoints that determine if the cycle will continue.
b) move chromosomes to the new daughter cells.
c) produce more chromosomes before the cell divides.
d) grow and produce enough cytoplasm to fill two cells.

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.

b

explanation: