Since Apex sharing reasons are not available for standard objects, so sharing individual records of standard objects is not possible.

The ‘Sharing’ button has been added to the page layout of ‘Associate’ custom object. On any
Associate record, the Sharing button is not visible for sharing that record using an Apex
Sharing Reason. What could be the reason?

‘Sharing’ button has been added to the page layout of the ‘Account’ object. OWD of account
is public read/write. On any Account record, the Sharing button is still visible for sharing that
record using an Apex Sharing Reason. What could be the reason?

Until an Apex Sharing Reason is created, a record of a custom object cannot be shared
manually on a one-off basis.

If a record of Associate custom object has been shared using an Apex Sharing Reason, then
that Apex Sharing Reason cannot be deleted until the sharing of that record is changed to
use some other Apex Sharing Reason.

Once a sharing rule has been created based on owner, then it can be modified to make it a
sharing rule based on criteria.

Which of these can have only one of them active at a time?

Automatic case escalation can be disabled.

Escalation Rules and Auto-Response Rules are available only for cases.

Conflict Resolution tool is available in?