About 45 to 60 minutes after ltp, all of the following occur among dendritic spines except
a. partial bridging of the cleft
b. appearance of more ampa receptors that are transported from the dendrites
c. enlargement or splitting to become separate spines
d. pruning of those that were not used in the process

Pruning of those that were not used in the process.

Explanation:

LTP (long-term potentiation) may be defined as the strengthening of the synapse that are mainly based on the recent pattern activity. They are mainly based on the synaptic activity.

This LTP also denotes the phenomena of the synaptic plasticity. Dedndritic spines shows the LTP. The binding of the cleft occurs at the synaptoc end and the transfer of the receptor strength increases. Different spines amy form during the LTP. The pruning do not occur even if they are not in use.

Thus, the correct answer is option (d).

enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.