Explanation:
spirogyra
<u>Phylum</u><u>:</u><u> </u>Chlorophyta
<u>class</u><u>:</u> Zygnamatophyceae
<u>Order</u><u>:</u> Zygnematales
Answer:
D i believe
If you think about it, they tell different parts of your body what to do. Hope this helps you!
Answer:
They found evidence of an impact crater in Mexico
Explanation:
The K-Pg boundary is the boundary between the Cretaceous period and the Paleogene period, but also marking the end of the Mesozoic era and the beginning of the Cenozoic era. This boundary is dated to roughly 66 million years ago. The K-Pg boundary is characterized with a mass extinction. The dominant organisms on Earth all died out, including the dinosaurs, both terrestrial and aquatic, as well as the flying reptilians, with only the birds surviving from that super-family. The reason for the mass extinction has been an impact with an asteroid or a comet, that was very large and hit the Earth where the Yucatan Peninsula in modern day Mexico is located. The impact was devastating, with heat waves, tsunamis, earthquakes, triggering of the majority of the volcanoes, wildfires, all combined managed to devastate the environment, thus big portion of the species living in it as well. The lucky survivors were smaller organisms, and the mammals turned out to be the most successful in occupying the empty niches and have became the dominant organisms on the planet.
<span>Zircon is a zirconium silicate mineral which is ideal for use in age-dating. The importance of zircon as an age-dating tool include; its good hardness (which means makes it resistant to metamorphism, mechanical and chemical weathering), it is easy to chip, it undergoes radioactive decay and leads to damaged crystals, it is commonly found at many localities, and it has a very high lead versus uranium ratio which is used to determine the age of the rock.</span>
D. the floodplain shrinks