according to darwin, why do modern giraffes have long necks?
a
giraffes have always had long necks like the modern ones.

b
earlier short-necked giraffes stretched their necks over a long period of time.

c
ancient giraffes developed short necks and pass this trait to their offspring.

d
giraffes born with longer necks would survive better in an environment with tall tr

b

Explanation:

They couldn't reach the trees and the stretching made their neck grow.

C - according to Darwin, giraffes with longer necks had the advantage in the environment and survived, reproduced, and passed this trait on to offspring.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion