Archaeologists studying an archaeological site use seriation to :
<u>determine the relative age of each layer of objects</u>
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Explanation:
- The goal of archaeology is to understand how and why human behavior has changed over time.
- Archaeologists search for patterns in the evolution of significant cultural events such as the development of farming, the emergence of cities, or the collapse of major civilizations for clues of why these events occurred.
- Archaeologists use a statistical sampling method to select which squares or units they will excavate.
- They will collect surface artifacts, then remove any ground vegetation. Archaeologists screen all soil removed from a unit to recover small artifacts and ecofacts.
- Artifacts include tools, clothing, and decorations.
- Non-portable remains, such as pyramids or post-holes, are called features. Archaeologists use artifacts and features to learn how people lived in specific times and places.
- Archaeologists might study the million-year-old fossils of our earliest human ancestors in Africa.
Answer:
b. the positive feedback's effector responses are in the same direction as the initiating stimulus rather than opposite of it
Explanation:
Both positive and negative feedback have the same components:
1. Stimuli - external or internal
2. Sensors - detect the stimuli
3. Control center - processes the information (CNS)
4. Effectors - activated by control center
Negative feedback loops act to oppose the stimulus.
Unlike negative feedback loops, positive feedback loops amplify the starting signal.
Answer:
<u>Option-(A,D):</u> Consistent fitness benefits of high allocations to defense and differing strategies for overcoming plant defenses among herbivores.
Explanation:
The plants or primary producers are there in order to provide the optimum amount of energy for the different beings to survive, but there are some limitations for each living being itself and for that reason the plant life have also evolved it self not be over consumed by the herbivores or the primary consumers. As the herbivore are also evolving through time as they assembled there system and chemical balances that corresponds to any of the harmful material present inside the plants body and during the ingestion of such body parts the herbivores may be effected. So,they have evolved there body system in order to make some arrangements for confronting any complication faced by them.
Answer:
The correct answer is: b. lightening of media in the unsealed tube only.
Explanation:
- According to the question, the bacteria can undergo only aerobic respiration, that is it can produce its energy, that is, ATP, or adenosine triphosphate, only in the presence of oxygen.
- The unsealed tube allowed air or oxygen to pass into it which can be used by the bacteria for its respiration. In the process, it will produce acid that will cause the media colour to lighten.
- The sealed tube do not allow any oxygen to pass into it. As the given bacteria can undergo only aerobic respiration but not anaerobic respiration, in absence of oxygen it will not be able to undergo respiration and produce energy and acid. Hence, the media colour will remain unchanged.
- The control tube is used to check the sterility of the media.
