What do we conclude if a planet has few impact craters of any size?

I would say that we could conclude that the Earth is not very old compared to nearby planets/planetoids

2. this rock sample is limestone and shale. with what you know about rock formation, what type of environment did these organisms live in?

d. stage 4

explanation:

the existence of some kind of demographic transition is widely accepted in the social sciences because of the well-established historical correlation linking dropping fertility to social and economic development.[1] scholars debate whether industrialization and higher incomes lead to lower population, or whether lower populations lead to industrialization and higher incomes. scholars also debate to what extent various proposed and sometimes inter-related factors such as higher per capita income,lower mortality, old-age security, and rise of demand for human capital are involved.[2]