The answer is D. The life cycle of a star is dependent on its mass. Stars by forming at nebulas as protostars. When the sun exhausts hydrogen fuel at its core, the core begins to fuse helium to carbon and the core becomes hotter but smaller. The outer layers are pushed outwards and the sun becomes larger and paler. Later, the helium fuel begins to run out and the sun loses the outer expanding layers into a planetary nebula. The remaining core is a white dwarf.
Stars that are 10 times our sun's solar mass just explode to supernovas when their hydrogen fuel is exhausted.
Answer:
Change the number of neutrons in an atom and it becomes an isotope, change the number of electrons, it becomes an ion. When you change the number of protons in an atom, you will change the atom from one element to a different element. Sometimes, when you add a proton to an element, the element will become radioactive.
Hope this helps!
Answer:
a) silt is the best type of soil for growing bean seeds
Answer:
3. intestinal phase
Explanation:
Intestinal phase starts at the first segment of the small intestinal where we have the duodenum. In this phase, the partly digested food called chyme stimulates the enteroendocrine cells of the duodenum causing the release of the secretin hormone. The secretin is one of the hormones in the duodenum. It is a peptide hormone that functions mainly in regulating the acidity of the duodenum. The secretin hormone stimulates the secretion of bile in the liver and also initiates the secretion of bicarbonate in the pancreas in response to the acidity of the chyme.
<span>An ecosystem can be thought of as a community of plants and animals that livesymbiotically. An ecosystem can ... No life could exist without it.</span><span>
</span>
