Possible contaminate will be Proteus or Salmonella. To differentiate the two genera urease test can be accomplished. However, urease test, Proteus will produce a positive test result.
This test can be done to determine the ability of an organism to split urea. The principle of urease test is that urea is the product of decarboxylation of amino acid. Splitting of urea via hydrolysis will produce ammnonia and CO2. The CO2 produce allows the formation of bubbles.
Answer:
Cambrian explosion
Explanation:
Cambrian explosion is a geological event that happened during the Cambrian age (541 million years ago). In this period, most of the animal phyla (including marine) appeared and their geological record is preserved in the form of fossils. The period lasted for 13-25 million years. Before this period, the organisms were very simple. They were mostly unicellular in nature and were living in the form of colonies.
The remaining three options are incorrect. They are tectonic events that reflect movement of continents in different geological times. None of them resulted in the diversification of (marine) animal phyla.
Answer;
Biophysics
Explanation;
-Biophysics is the study of physical phenomena and physical processes in living things, on scales spanning molecules, cells, tissues and organisms. Biophysicists use the principles and methods of physics to understand biological systems.
-It is an interdisciplinary science, closely related to quantitative and systems biology.
-The electrocardiogram is a diagnostic tool that is routinely used to assess the electrical and muscular functions of the heart. During an ECG, sensors that can detect the electrical activity of your heart are attached to your chest and sometimes your limbs.
If the image contains life forms and living things, then it is the biosphere.
If the image contains frozen water bodies, such as the arctic tundra, it is the cryosphere.
If the image contains soil and other solid abiotic components of the Earth, then it is the geosphere.
If the image contains water in the liquid form, then it is the hydrosphere.
It's the first one, prokaryotic cells don't have membrane bound organelles, including the nucleus
