Agroup of college students working on a project on bio-gas have found some bacteria in the bio-gas plant. these bacteria can utilize methane as their source of energy and do not need oxygen for their survival. what kind of bacteria could they be?
a. archaebacteria
b. eubacteria
c. probacteria

Apart of an ecosystem that can restrict the growth of a population is referred to as

The table presents the average day and night temperatures in five cities. it also reveals whether a city receives substantial rainfall (wet climate) or little rainfall (dry climate). which city’s rocks are likeliest to experience frost wedging, and why? a) city a because the consistently subzero temperature would prevent water from melting b) city b because it is a wet region and the temperature fluctuates around the freezing point c) city c because it receives plenty of rain fall and the weather is moderately cool d) city d because the hot and dry weather would cause rocks to absorb water

What is the difference between a meteoroid and a meteor?