Which of the following statements are true regarding passive transport? Choose 2 answers:
Simple diffusion, a type of passive transport, requires the use of membrane proteins.
Carbon dioxide can pass through a cell membrane via passive transport.
Oxygen cannot enter a cell through passive transport.
Charged ions cannot pass through a cell membrane via passive transport.

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.

in situ hybridization has been widely used for research applications, including clinical cytogenetics, gene mapping, tumor biology and studies of chromosome evolution.