Alleles, or genes i think
The right answer is 28 years.
The half-life, or period of a radioactive isotope, is the time required for half of the nuclei of this isotope initially present to decay naturally.
One gram of pure 90 strontium has a radioactivity of 5.11 TBq. Its beta radiation is not penetrating, which makes it difficult to measure when it is in the soil or a matrix. It is very harmful when the particle is inhaled or ingested.
<span> ocean currents on Earth
next time include a pic pls</span>
The Earth has four spheres in which everything that can be found on earth is placed. The spheres are: hydrosphere, biosphere, lithosphere, and atmosphere . Hydsropshere consists of all water found on Earth, it comes from the word ‘hydro’ which stands for water. The biosphere includes all living things. animals, plants, and microorganisms. The litosphere comes from the word "litho" which means land and includes hard and solid land mass on the earth’s surface and rocks. The atmosphere come from the word "atmo" which means air and is made up from the air, which is a mixture of gasses.