৮৩৯৫
Egyptians are credited "as having" pioneered preserving methods as long ago as 2650 B.C
উত্তর
with having
৮৩৯৬
Some bat caves, like honey- bee hives, have residents that take on different duties such as defending the entrance, "acting as guards and to sound" a warning at the approach of danger, and scouting outside the cave for new food and roosting sites.
উত্তর
acting as guards and to sounding
৮৩৯৯
Because the enemy had a reputation for engaging in snake attacks, we were ___ on the alert.
উত্তর
constanly
৮৪০০
___________ has introduced the tremdous problem of the retraining of hundreds of workers replaced by machines.
উত্তর
Automation