Answer:
The mass of a star determines its life cycle, that is, more the mass, shorter will be its life cycle. The mass of the star is determined by the concentration of matter, which is found within its nebula. In the nebula, with time, the hydrogen gas comes in close proximity with each other due to gravity and starts to spin.
With the brisk spinning, the gas heats up and turns into a protostar. The temperature now reaches 15,000,000 degrees and within the core of the cloud, the phenomenon of nuclear fusion takes place. The cloud now contracts a little, starts to glow brightly, and turns stable. The cloud now becomes a prime sequence star, and will stay in this phase for millions of years, the Sun of our galaxy is in this stage at the moment.
Answer:
B. Sends and receives signals throughout the body.
Answer:
b. The phylogeny would support a single origin for vessels.
d. Seed plants as a whole would be monophyletic.
e. Cycads would be the sister group to all other seed plants.
Explanation:
Answer:
ITS TRUE
Last week, the House Committee on Science, Space and Technology, chaired by climate contrarian Lamar Smith, R-Texas, held a hearing on climate science. The hearing featured three scientists who are dubious about the conclusions of the majority of climate scientists, and climate scientist Michael Mann, best known for his “hockey stick graph” of temperatures over the last thousand years illustrating the impact of humans on global warming.