Plants have a cell wall and chloroplasts; animal cells do not have either
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<span>It answers D. Mitochondrial DNA stay almost identical over species and only varies ever so slightly. By comparing mitochondrial DNA over species you are able to see how closely related they are and how long it might have taken for the species to evolve.
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Periosteum is the thin yet tough outermost layer of bones. Its many collagen fibers support the bone and firmly connect it to the surrounding structures. Osteogenic cells in the periosteum play a vital role in the growth and repair of bony tissue.
The role of the plants is to maintain the atmosphere and to produce oxygen and to absorb carbon dioxide
Answer:
Because the pulsar is slowly destroying its companion.
Explanation:
J1311 is a fast spinning neutron star, which means it emits strong beams of radiation from it's poles.
As the beam of the pulsar sweeps across the surface of the companion star, it heats it up and blows its material outward into space, thus decreasing its mass.
As the pulsar continues sweeping its beam across the brown dwarf, it will continue to blow its material away, which eventually will evaporate the whole companion out of existence, thus leaving the pulsar without a companion star.