Answer:
Endoplasmic reticulum
Explanation:
Endoplasmic reticulum is known to be a site where many cellular components are synthesized and also, it is found to be internal membrane of the eukaryotes. Thus, endoplasmic reticulum exists in two forms which include rough and smooth endoplasmic reticulum. Furthermore, it perform important role in the synthesis of lipids and modification of proteins.
Answer:
An object’s position changes if there is a change in reference point.
Thus Option A is the right answer
Explanation:
When a place and object is used to compare whether an object is in motion or not, this place or object is considered as reference point. We call an object is moving when the distance between that object and another object changes.
In order to find out a movement of an object we generally consider the reference point as still. We say an object is in movement when it changes position in relation with the reference point.
Answer:
Question 17: B: They may provide evidence that Pennsylvania was once covered by warm ocean waters since most corals are presently found in these environments.
Question 14: I think the answer for this question might be A. But I'm not sure.
Question 10: D: Plates move toward each other and volcanic mountains form.
Answer:
The threshold in biology is explained in terms of neuroscience or action potential that affects nervous system.
The threshold value is the value that identifies incoming signals that should be sufficient enough to generate an action potential. The potentials generated by the signals are additive, and reaches threshold depends on their amplitude and frequency.
An absolute threshold is defined as the minimum level of signals like light, touch or sound , detected by any organism and allows them to react.
While Difference threshold allow to detect difference between two different signals.