42. what do we observe that indicates most objects in the universe are moving away from each other? a) blue shift of stars and galaxies b) red shift of stars and galaxies c) the universe and galaxies are all rotating d) galaxies are many light years apart the further they are from the sun.

A and can you help me with my geography homework please it is-
Question - To what extent can ecotourism be used as a strategy for sustainable development in Costa Rica. (9 Marks)

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city.