Non-native (exotic) species can become
_species when they out compete
the native species.
Keystone
Invasive
Exotic
Extinct
Umbrella

answer; ///(b) it is composed of four protein chains and four heme groups;

the index of refraction of the second medium is higher. i just took the test trust me !

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

true skin; another name for the dermis. lies directly beneath the epidermis and is often referred to as the true skin. outermost layer of epidermis, consisting of dead cells.