<span>The genome of the E. coli bacteria is very crisp and simple with only 4400 genes, easy to study and understand. The ability of the bacteria to multiply drastically producing a generation in 1200 seconds under suitable growth condition dragged the attention of the researchers. Coming to the safety in handling the organisms, except for the particular harmful strain (O157:H7), the normal organism from the flora of the gut is safe to handle under suitable microbiological environment. The first completely sequenced genome is an additional feather in the cap of E. coli making the bacteria easier to use in recombinant DNA technology which involves nothing but the ultimate expression of proteins. Also the competence of the E. coli bacteria as a host for foreign DNAs and simple laboratory procedure to cultivate and adaptability to both aerobic and anaerobic environment made the E. coli bacteria a pioneer in the field of biotechnology.</span>
<span>An endocrine gland secretes its products, for example, hormones, directly into the blood but a</span><span>n exocrine gland secretes its products for example enzymes, into ducts that lead to the target tissue.
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Answer: The correct answer is as follows:
Stage 1) Egg - Frogs begin their life as fertilized eggs. A typical female frog can lay thousands of eggs, depending on the species. In the pond, the eggs float on the water in clusters until they hatch in 2-3 weeks.
Stage 2) Larva (tadpole) - During the tadpole stage, the frogs eat, grow and develop into froglets (with four legs) through a process called metamorphosis. As tadpoles, they rely on rudimentary gills, mouths, and tails for swimming. The tadpole's diet includes other frog eggs, bugs, mosquito larvae, and other dead insects. As their four legs and external respiration develops, the froglet is almost ready to leave the water.
Stage 3) Adult - At around 12 weeks of age, the frog has reached maturity as an adult and is ready to explore dry land. With its gills and tail totally absorbed back into the body, the frog remains an amphibian but spends most of its time out of the water. As an adult, the frog uses its sticky tongue to capture and eat insects, snails, slugs, and worms. They return to the water to lay new eggs and the cycle of life repeats.
Explanation:
