Answer:
Gravity.
Explanation:
Gravity is the force by which a planet or other body draws objects toward its center. The force of gravity keeps all of the planets in orbit around the sun.
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The question isn't too clear but I'm guessing it would be Lamarck's theory. Which is as organisms use their body parts, over time they develop.
Answer:B cell sub-type that are formed within germinal centers following primary infection. Memory B cells can survive for decades and repeatedly generate an accelerated and robust antibody-mediated immune response in the case of re-infection (also known as a secondary immune response).
Explanation:
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<span>Answer : spores, which grow into
a gametophyte<span>
</span><span>A
sporophyte produces spores therefore those plants that have spores is called
sporophyte. A sporophyte is a type of a diploid organism so, which means
that meiosis must occur in order to be able to produce haploid cells containing
half number of chromosomes. Meiosis in sporophyte occurs in an area called
sporangia. The spores that are being created inside sporangia shall be release
into the air. Mitosis is expected to take place on a single haploid spore in
order to be a multicellular gametophyte.</span></span>