They made gun powder and wood block printing <span />
Yes and no. Mutations in experiments can be helpful to learn new things medically. At the same time negatives can come from it like stronger viruses.
Answer:
uber eats and postmates
Explanation:
the reason i think both are doing great is because this pandemic is making people lose there jobs so job like these are coming in handy and also because for those who dont have a car or had a car but cant pay it off do to this pandemic you can use a bike to pick up n deliver
Answer: Secondary source
Explanation:
Secondary source could be defined as a source which still gains it's knowledge from the primary source. The secondary source has no first hand witness in the event but only narrates what they are being told or studied. The information from the museum tour guide who shows you around the exhibit and shares facts with you is a secondary guide based on they didn't witness the information first hand but were told or studied