Atmospheric C02 from the past 500,000 years is measured by looking at: A: Ocean Cores
B: Ice Cores
C: Tree rings
D: All of the above

Which class of molecules contains the amino group, nh2 (a) sugars (b) water (c) proteins (d) hydrocarbons

How do plants obtain more sunlight a.) they lean towards the light b.)they grow straight up c.) they only live in sunny areas, like the tropics d.) they stay low to the ground

Why should organisms reproduce more offspring than will survive? select all that apply.