Answer:
a. 0.5 grams b. 0.25
Explanation:
Just use the half-life formula(I linked it below)
a. 4(1/2)^90/30=1/2
b. 4(1/2)^120/30=1/4
Since this is movement that is occurring against the natural movement from high to low concentration, this is Active transport.
The option C.
True.
In the upper layers of the atmosphere, it blocks UV radiation from the sun; however, in the lower layers, it is a pollutant.
First i would like to discuss the design with the head of the construction crew that are capable of understanding the engineering part, then ask him if the design is feasible, if its realistic, if it is safe to be house and if it is safe to work on by the workers. and it would be his task to deliver it the others
Human activities in the united states such as burning fossil fuels for electricity, heat, and certain transportation.
hope this helps :)
