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For this reason, fossil collectors commonly break open concretions in their search for fossil animal and plant specimens. [9] Some of the most unusual concretion nuclei are World War II military shells, bombs, and shrapnel, which are found inside siderite concretions found in an English coastal salt marsh. [10]
Diagram of stages of embryo development to a larval and adult stage. In developmental biology, animal embryonic development, also known as animal embryogenesis, is the developmental stage of an animal embryo. Embryonic development starts with the fertilization of an egg cell (ovum) by a sperm cell (spermatozoon). [1]
Images of embryos provide a means of comparing embryos of different ages, and species. To this day, embryo drawings are made in undergraduate developmental biology lessons. Comparing different embryonic stages of different animals is a tool that can be used to infer relationships between species, and thus biological evolution. This has been a ...
Relationship of major animal lineages with indication of how long ago these animals shared a common ancestor. On the left, important organs are shown, which allows us to determine how long ago these may have evolved. The organ level of organisation in animals can be first detected in flatworms and the more derived phyla, i.e. the bilaterians.
Diagram of a two-layered eggshell. Fossil dinosaur eggshells, like modern bird and reptile eggshells, are made up of calcium carbonate crystal units. The basic arrangement and structure of these eggshell units (called the ultrastructure) is used to divide fossil eggs into several basic types, including the spherulitic, prismatic, and ornithoid ...
a basic diagram on the elements conforming a prokaryote cell. in this case a bacteria: Date: 26 April 2006: Source: i did the diagram myself using adobe illustrator , as source for the information i used this websites , ,, and : Author: Mariana Ruiz LadyofHats: Permission (Reusing this file) public domain: Other versions: multiple languages
These cells include vulval cells as well as muscle and neurons. This research also led to the initial observations of programmed cell death, or apoptosis. After mapping various sections of the C. elegans' cell lineage, Dr. Brenner and his associates were able to piece together the first complete and reproducible fate map of cell
The dynamics of heat in animal shelters is influenced by the construction material which may act as a barrier, as a heat sink or to dissipate heat. The cocoons of insect are a case in point. An interesting example is the case of silk caps which cover the pupal cells of the Oriental hornet Vespa orientalis. Firstly, the silk insulates the pupa ...