A simple worksheet covering the basics of photosynthesis
A Simple Diagram of Photosynthesis ..
show that some animals were mobile before the Cambrian Explosion. Sponges were probably the but they were immobile except for their flagella drawing water through them, which carried food and oxygen in and waste out. The first creatures that we would recognize as animals were probably worms crawling atop ocean sediments. As lowly as the worm might seem, it would have needed muscles, bilateral symmetry, a circulatory and digestive/excretory system, and a nervous system run by a brain; that distant ancestor probably possessed . Some early worms may have even had rudimentary eyes. And of possibly eonic importance, worms probably made the first poop. The evolution of may have been a seminal event in the organic carbon burial process. Sponges may have also been largely responsible for initially removing oceanic carbon, which helped increase atmospheric oxygen and helped ventilate the oceans. Until then, organic carbon from dead life forms would not have settled to the ocean floor, but would have floated in the water column and been recycled by other life forms. Although the hypothesis , feces sinking to the ocean floor may have been how life’s burial of carbon began, as well as robbing sulfate-reducing bacteria in the water column of their nutrients and thus enabling oceanic waters to remain oxygenated. Ediacaran fauna did not burrow into ocean sediments, but deep burrowing was characteristic of Cambrian sediments. There is debate today whether Cambrian burrowing was a of oxygenating the ocean floor.
The simple story of photosynthesIs in a little over 3 minutes
The primary unit of organization is a , which consists of a single ancestor and all of its descendants. The study of body features has been augmented by recent findings in molecular biology. Many organisms have had their , and many more will in the future. Many common features among diverse organisms are due to and not ancestry, as organisms independently developed similar solutions to life’s challenges.