This was the San Diego of 130,000 years ago, as it would have appeared to early humans who, according to controversial new research, may have lived there. Recently discovered stone tools and the broken bones of a mastodon these humans apparently attacked are evidence archaeologists may have gotten early human history completely wrong. Because up until now, researchers believed Homo sapiens or their predecessors were not in the Americas until about 20,000 years ago.
Compound: two or more different atoms chemically bonded together. Molecule: two or more different or same atoms chemically bonded together. A mixture: contains two or more substances that are not chemically bonded together Hope this helps!!!!!!
Answer:
Only Photosystem I - 1, 5, 6
Only photosystem II - 3, 2
Both Photosystem I and II - 4
Explanation:
Only Photosystem I
a) Reduction of NADP+ - uses light energy to convert NADP+ to NADPH2
b) Reduction of electron transport chain between the two photosystems
c) Oxidation of electron transport chain between the two photosystems.
Only photosystem II
a) Oxidation of water - here the absorbed light energy is used to dissociate of water molecules to produces protons (H+) and O2 along with free ions
b)Reduction of primary electron acceptor - An electron is taken by pheophytin which is a primary electron acceptor molecule that is located within photosystem II and hence it get reduced.
Both Photosystem I and II
a) Light is absorbed in both photosystem I and II. While in photosystem I, light waves of large wavelength i.e 700 nm are absorbed, in photosystem II light waves of short wavelength of i.e 680 nm are absorbed.
Energy doesn't mean it's necessarily available to do work. energy exists in several forms such as heat, kinetic or mechanical energy, light, potential energy, and electrical energy. (etc.)
North of the arctic circle
