20. the effect of human disturbance on animal populations is
stabilizing
o density-independent
odensity-dependent
o unobservable

The effect of human disturbance on animal populations is density-dependent.

Explanation:

The sudden rise in the population of human lead to high stress on nature which lead to natural resource crunch and adverse impact of animals and nature.

Disturbance are the changes into the environment of animals caused by human activities like clearing forests, resource extraction , industrialization etc. They have extreme effects on the wildlife. They decrease the performance of the prey.  

not clear

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.