<h3><u>Answer;</u></h3>
B. When an antibiotic is used, bacteria that have a natural variation for resistance to the antibiotic have a greater chance of survival.
<h3><u>Explanation</u>;</h3>
Antibiotic resistance is a consequence of evolution via natural selection.
The antibiotic action is an example of environmental pressure to bacteria, therefore; those bacteria which have a mutation allowing them to survive will live on to reproduce.
They will then pass this trait to their offspring, which will be a fully resistant generation.
The natural extinction rate defines background extinction
<u>Explanation:</u>
Extinction endured primarily control of paleontology. Background extinctions are the continuous importance of common environmental variations, local disasters, or inter species conflict. Background extinction is principally a local appearance. It happens only one or a few species at any time, habitually inside a distinct area.
Ecologists measure that the present-day extinction rate is 1,000 to 10,000 times the background extinction rate between one and five species per year because of deforestation, environment loss, over hunting, pollution, climate modification, and other human activities.
Answer:
paracrine signaling.
Explanation:
Chemical signaling between cells is one of the most important ways that activities of tissues and organs are coordinated. The nervous system is the other major coordinating system in animals, but even here chemical signaling is used between adjacent neurons. The mechanisms involved are described as either being paracrine, autocrine, intracrine, endocrine, neuroendocrine or pheromones. Paracrine signals diffuse locally and act on neighboring cells.
Answer:
Ray finned fish are also classes of tilapia
The skateboard's acceleration would decrease!!!!