Amino acid-based hormones use a second messenger, cyclic amp, but steroid hormones

trigger a response by their buildup along the cell membranes, stopping key materials from entering the cell

must use atp to enter the cell, releasing adp into the cytoplasm, which then becomes cyclic amp

complex inside the nucleus with a receptor and dna to initiate protein synthesis

i'd say that the moon rock is about 2.2 billion years old.

feral cats are estimated to eat tens of millions of native animals each night in australia

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.