B. Chitin- its a hard and tough substance that occurs widely in nature, particularly in the shells (exoskeletons) of arthropods such as crabs.
Answer:
Pathogenic bacteria found in many hospitals are antibiotic resistant.
Explanation:
Antibiotics are chemical compounds able to kill or stop the growth of bacteria. Antibiotics are used as medicine to kill pathogenic bacteria within the human body.
Although antibiotics are designed to kill bacteria, bacteria evolve quite fast and it is very common to see how bacteria adapt and become resistant to antibiotics. This is a clear example of natural selection.
Natural selection is a process in which the best adapted individuals have greater of survival and passing their genetic traits on to the next generation. In relation to antibiotics, although they manage to kill many bacterial individuals, some few individulas survive, and they become resistant to that antibiotic. For this reason, the pharmaceutical industry is always trying to make more potent antibiotics.
The cell has little compartments called organelles. These organelles are similar to our organs, which carry out life processes for our bodies to survive. Organelles are just tiny organs within a cell
Assuming this is a blank free fill question, a whole prehistoric insect could be found trapped in amber.
Answer:
Predatory interaction and competitive interactions
Explanation:
The negative relationships of the great white shark includes-
Predation between the great white sharks and the seal... the great white shark here is a predator and it feeds on the seals and other marine animals.
Interspecific competition between the Killer whales and the great white sharks: Orcas, also known as killer whales like to eat seals too and they live in the same areas as great white sharks.