This is a huge area of discussion, therefore, you must be in truth selective of your topic, and write succinctly and to the point. For example, you may want to bring the theme of reproductive strategies of fishes, amphibians, reptiles, birds, and mammals, or you may choose travel, environmental adaptations, etc etc etc - the list is endless. I am interested in reading your specific interest in evolutionary biology.
Throughout the millions of historic period of evolutionary progress, the human being, a mammal of great ground came to be. But, it wasnt always that way, from the Cambrian times forward, we have been evolving, species by species, through with(predicate) the ability to physically, physiologically, and behaviorally change and adapt to the environment around us. As the environment changed from hot to cold, wet to dry, so did the species that lived in those areas. For those who could non adapt in their environment, they either moved on or died. Through the ages, we went from jawless and cartilaginous fishes all the way to amphibians, reptiles, birds, mammals, and at long last to human beings.
The earth experienced its first vertebrate in the Cambrian times. These vertebrate animals were of two different kinds of fishes, some with jaws and others without. Of the jawless fishes, we have ostracoderms, a small fish with a notochord and a cavity for the brain.
Their bodies contained dentin, a material found in teeth today. Thus, we have a marker for the long evolutionary explode through history! The ostracoderms were simply bottom feeders, living in complete submersion of water, eating and nourishing themselves through filters. They win food by attaching themselves to the food and eating from it in a filter-like method of sucking the food down and digesting it from there. The lamprey and the beldame had a unique way...
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