The popularity of people is decreasing
In evolutionary theory, adaptation is the biological mechanism by which organisms adjust to new environments or to changes in their current environment. ... This enables better survival and reproduction compared with other members of the species, leading to evolution.
River valley trade made them key economic areas.
Hope this helped. :)
Answer:
1.Mercury, Venus, Earth and Mars
2.global warming and climate change; water pollution and ocean acidification; and loss of biodiversity.
3.
Answer:
The best answer is mountains and valleys
Explanation:
first option doesn't seem correct because it doesn't have one giant plateau. Instead it is multiple. so that option is incorrect.
second option is incorrect because there really is no evidence about plains and hills.
third option is incorrect for the same reason as second option.
The Fourth option is correct because Sub-saharan contains mountain ranges and multiple rift valleys.
(have a nice day and soon merry christmas or happy Hanukkah)
