These maps show changes that occurred between 2006 (left) and 2015
(right).
sidor
ozone (dobson units)
which sentence best describes the changes shown?

a. the hole in the ozone layer over antarctica got smaller.

b. the hole in the ozone layer over antarctica got bigger.

c. the hole in the ozone layer over antarctica disappeared.

d. the hole in the ozone layer over antarctica did not change.
o

The hole over antartica has gotten smaller

Explanation:

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

a

explanation:

many plants naturally reproduce this way, but it can also be induced artificially. horticulturalists have developed asexual propagation techniques that use vegetative plant parts to replicate plants. success rates and difficulty of propagation vary greatly. monocotyledons typically lack a vascular cambium and therefore are harder to propagate.