Gram-positive and Gram-negative are different in their resistance to antibiotics. It is because of their different structure of cell wall. Gram-positive bacteria have a thick peptidoglycan cell wall and dyes purple in the Gram test (for categorization of bacteria). Gram-negative bacteria have thin peptidoglycan layer and do not turn purple. Gram-positive bacteria are easier to kill because their thick peptidoglycan layer absorbs antibiotics.
<span>The mats increase access to dissolved oxygen.</span>
Answer:
A: The amount of energy available in the organisms at each level.
Explanation:
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<span>The taiga is an extremely cold area that has constant food shortage and harsh conditions. The lynx does not migrate from the taiga during any period, but rather stay there year round. The lynx is currently waiting to get a place on the endangered species list.
Their habitat is being rapidly destroyed, and many farmers view them as a pest that threatens livestock and other animals that are essential to the farm. Additionally, people hunt the lynx for their fur coats and for their meat.</span>
Answer: Option B
Explanation:
The umbilical cord is the flexible structure connecting a foetus with the placenta; which transports nourishment (oxygen, glucose, drugs) to the foetus and removes waste (blood rich in carbon dioxide and depleted in nutrients).
Also the umbilical vein is a vein present in the cord that carries oxygenated blood from the placenta to the growing fetus .
Note: Options A, C and D are inaccurate