Of the natural resources listed, which four can be harvested with simple tools and relatively little risk?

lightning
hydropower
wheat
diamonds
timber
water
iron
corn
its my !

satellites are frequently used to make observations of the orbit on earth

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.