Answer:
hydrogen and helium couldn't form until the universe had cooled enough to allow their nuclei to capture electrons, about 380,000 years after the Big Bang. Within about 3 minutes after the Big Bang, conditions cooled enough for these protons and neutrons to form hydrogen nuclei.
Explanation:
Answer:
Some insects with Bt resistance genes are able to survive in the presence of Bt toxin. Natural selection favors these insects and increases their proportion in future generations.
Explanation:
Some of the insects in the insect population have one or more genes that impart Bt resistance to them. These insects are able to survive in the presence of Bt toxin while the ones that lack these genes simply die by Bt toxin. Natural selection allows these insects to leave more progeny in the future generation which in turn results in increased frequency of the Bt resistance gene in the future populations. This results in the spread of Bt resistance among insect populations.
Answer:
C
Explanation:
Volcanic activity spews greenhouse gases, such as carbon dioxide, into the atmosphere. These gases reduce albedo because they do not allow particular wavelengths of light to escape into space after hitting the earth’s surface. This is how they cause global warming that results in climate change.
Scientists have determined that humans are disrupting the nitrogen cycle by altering the amount of nitrogen that is stored in the biosphere
The correct answer to this question is "<span>B.Bacteria and Archaea </span>." <span>Based on the table, the domains that contain only one cell type is the </span>Bacteria and Archaea. The archaea <span>constitute a domain and kingdom of single-celled microorganisms.</span>