Affiliate Marketing Secrets

I’m reading the beak of the finch and I just got done reading it. There’s a quote that says…
“Chimpanzees in the last day of the African rain forests are teaching their children how to crack nuts with stones. They are taking the kinds of halting,modest steps that might, if favored, if selected for many generations, carry them on a path toward something like our niche. Watching them, human observers notice striking variations in intelligence from individual to individual. Where there is genetic variation, there is room for selection and evolution. Probably in every line of primates there are a few, like Imo on her island, who could lead their kind in our direction. But at the moment of course that path is blocked. The thinking niche is taken, at least for the moment.”
I don’t understand what the few lines mean. If anyone knows, please tell me what it means esp the the thinking niche is taken…

1. Why does little sunlight reach the floor of coniferous forests?
a.)trees grow in dense stands
b.)the far north gets little sun
c.)the soil is poor
d.)these forests lack diversity
2. In North America, in what direction would you usually have to travel to go from a coniferous forest to a deciduous forest?
a.)north
b.)south
c.)east
d.)west
3. Which deciduous forest layer gets the least sunlight?
a.)understory layer
b.)shrub layer
c.)canopy
d.)forest floor
4. What abiotic factor causes organic matter to decay more rapidly in deciduous forests than in coniferous forests?
a.)colder and dryer winters
b.)warmer and wetter summers
c.)more topsoil
d.)higher canopy
5. Animals might not return to a replanted deciduous forest because of its..?
a.)rapid tree growth
b.)empty niches
c.)lack of plant diversity
d.)greater openness
6. The tropical zones have stable year-round temperatures because of their
a.)abundant rainfall
b.)mountainous terrain
c.)long growing season
d.)nearness of the equator
7. The teeming diversity of rain forests had led to
a.) too many communities
b.)overcrowding of herbivores
c.)species specialization
d.)life higher up in trees
8. Since 1950, what percentage of Earth’s rain forests have been lost to deforestation?
a.) 10%
b.) 6%
c.) 60%
d.) 40%
9. Which of the following is not a reason why rain forests are cleared?
a.)to find new species
b.)to make grazing land
c.)to export wood
d.)to make farmland
10. Which of the following statements is NOT TRUE of coniferous forests?
a.)rainfall is scarce
b.)seasonal temperatures vary widely