Answer:
Pollen grains are produced by meiosis of microspore mother cells that are located along the inner edge of the anther sacs (microsporangia). ... The tube cell (also referred to as the tube nucleus) develops into the pollen tube. The germ cell divides by mitosis to produce two sperm cells.
The first is gene sequencing. This allows the sequence of nucleotides on DNA of different organisms to
be identified. The sequence is then compared the bigger the difference in this sequence,
the stranger the organisms are with regards to the evolutionary relationship.
<span>The second is
carbon dating. This enables anthropologists
to determine the age of fossils by calculating the time taken, in half-lives,
by particular elements to decay, such as carbon-14 </span>
At a smaller scale, other scientists may investigate the processes involved in cycling water and the elements of life through the biosphere: carbon, nitrogen, sulfur, phosphorous, and other elements. These studies can also provide "ground-truth" - observations on the ground which are used to validate the remotely sensed data. As more and more observational and experimental data become available, other scientists construct models to help us understand the biosphere, how it evolved, and even provide tools that allow for predicting the future response of the biosphere to global change and human activities.
Your answer should be Excretion.
We depend on forests for our survival, from the air we breathe to the wood we use. Besides providing habitats for animals and livelihoods for humans, forests also offer watershed protection, prevent soil erosion and mitigate climate change.
