The amnion surrounds the embryo with a watery substance, and is probably an adaptation for breeding on land. Amphibians: The class of that contains the frogs, toads, newts, and salamanders. The amphibians evolved in the devonian period (about 370 million years ago) as the first vertebrates to occupy the land. They have moist scaleless skin which is used to supplement the lungs in gas exchange. The eggs are soft and vulnerable to drying, therefore reproduction commonly occurs in water. Amphibian larvae are aquatic, and have gills for respiration; they undergo to the adult form. Most amphibians are found in damp environments and they occur on all continents except Antarctica.
Allopatric speciation: that occurs when two or more populations of a species are geographically isolated from one another sufficiently that they do not interbreed. Allopatry: living in separate places. Amino acid: The unit molecular building block of, which are chains of amino acids in a certain sequence. There are 20 main amino acids in the proteins of living things, and the properties of a protein are determined by its particular amino acid sequence. Amino acid sequence: A series of amino acids, the building blocks of, usually coded for. Exceptions are those coded for by the of certain viruses, such as hiv. Ammonoid: relatives of cephalopods (squid, octopi, and chambered nautiluses these had coiled shells and are found in the record of the period. Amniotes: The group of reptiles, birds, and. These all develop through an that is enclosed within a membrane called an amnion.
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Algae: An umbrella more term for various simple organisms that contain chlorophyll (and can therefore carry out ) and live in habitats and in moist situations on land. The term has no direct significance. Algae range from macroscopic seaweeds such as giant kelp, which frequently exceeds 30 m in length, to microscopic filamentous and single-celled forms such. Allele: One of the alternative forms of a gene. For example, if a determines the seed color of peas, one allele of that gene square may produce green seeds and another allele produce yellow seeds.
In a cell there are usually two alleles of any one gene (one from each parent). Within a population there may be many different alleles of a gene; each has a unique sequence. Allometry: The relation between the size of an organism and the size of any of its parts. For example, an allometric relation exists between brain size and body size, such that (in this case) animals with bigger bodies tend to have bigger brains. Allometric relations can be studied during the growth of a single organism, between different organisms within a species, or between organisms in different species.
Adaptation: Any heritable characteristic of an organism that improves its ability to survive and reproduce in its environment. Also used to describe the process of genetic change within a population, as influenced. Adaptive landscape: A graph of the average of a population in relation to the frequencies of. Peaks on the landscape correspond to genotypic frequencies at which the average fitness is high, valleys to genotypic frequencies at which the average fitness is low. Also called a fitness surface.
Adaptive logic: A behavior has adaptive logic if it tends to increase the number of offspring that an individual contributes to the next and following generations. If such a behavior is even partly genetically determined, it will tend to become widespread in the population. Then, even if circumstances change such that it no longer provides any survival or reproductive advantage, the behavior will still tend to be exhibited - unless it becomes positively disadvantageous in the new environment. Adaptive radiation: The diversification, over evolutionary time, of a or group of species into several different species or subspecies that are typically adapted to different ecological (for example, darwin's finches). The term can also be applied to larger groups of organisms, as in "the adaptive radiation." adaptive strategies: A mode of coping with competition or environmental conditions on an evolutionary time scale. Adapt when succeeding generations emphasize beneficial characteristics. Agnostic: A person who believes that the existence of a god or creator and the nature of the universe is unknowable.
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In 2009 I was again out at the hunting area with rockhounding buddies Jack lola when Jack, stopping to rest for a bit, poked a bit of deep green jasper with his pole. Unable to move or unearth the piece, he came back shakespeare to the truck where we were having lunch to get us all. The find of a lifetime! Jack had found a whole tree on his very first time out. Talk about beginners luck! The pictures on this page are some of the pieces we recoved on that amazing day. An Unusual, specimen, home, copyright Ken Dinneen, all rights reserved. Glossary acquired trait: A characteristic, acquired during growth and development, that is not genetically based and therefore cannot be passed on to the next generation (for example, the large muscles of a weightlifter).
The road had a new drainage ditch which was at least thirty feet long. The dirt along the ditch was rich with all kinds of good pieces. I couldn't pick them up fast enough and some where so big I had to carry them back to the car. These were the size of my fist and bigger. I spent three hours collecting several pounds of rock. I took the load home to the rock saw. A couple pieces are specimen material, a few more are too good to cut up just yet.
the desert and the sky seemed to have an electric blue aura. It was beautiful to be out in the desert at 8:00. As I wandered closer to the road I saw a camper coming slowly toward. The man stuck his head out the window to ask if I had found anything. I told him not yet and he said "you're always only this far away" as he made his thumb and index finger form a small gap. He laughed, drove on, and then I started to get lucky.
We found twist little pieces and the more we walked and looked the more we were able to discover. It grew hotter and hotter and eventually we headed to the car for drinks and a lunch break. The heat began to take it's toll and we were getting tired. We headed back to the truck, dumped our finds but then went out looking for another half hour before we decided to pack it in for the day. I found some real honest to goodness Hampton Butte petrified wood and was very happy. Justin also found some interesting pieces and we both had a great time. I had never been to hampton Butte before justin and I went out there, but on tuesday the 26th I was back out searching again.
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Hampton Butte wood is a primarily green fossil of jasper and agate. This is another landmark central Oregon rockhounding area about 80 miles east of Bend,. To start the trip we loaded up the cooler with food and drinks and took off from Sisters. When we arrived, the first thing we noticed were newly posted, "no trespassing" signs nailed to some of the trees. That is an area where you must be careful to stay on blm land. This was my first time out mba to the area and I brought my nephew, justin along. We both noticed a lot of digging sites with piles everywhere. We found a likely place to park and Justin and I wandered for awhile searching for the beautifull green petrified wood that might lead us to a buried log.