200 bce was the last time we have seen them
The correct answer is known as "bot net".
A bot net is described as a cluster of Internet-connected devices, which may include smart phones, personal desktops, servers that are infected by a common malware, hackers pose this threat, since hackers are capable of hacking through internet-connected devices and may hack anyone without the owner's knowledge.
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Answer:
placebo control group
Explanation:
In order to determine that a drug has any effect in the body participants of a study are divided into two groups a group which actually receives the treatment and the other group receives a fake treatment. The participants are unaware of which group they belong to.
The fake treatment group is called the placebo control group. If the drug is actually effective then the placebo control group should not shoe the same effects that the treatment group is showing.
Here, the capsule received by group 2 looks like the capsule with the Ginkgo Biloba herb. The participants of group 2 should not show an increased blood flow to the brain. The participants of group 1 should show an increased blood flow to the brain. This would prove that the Ginkgo Biloba increases blood flow to the brain.
Answer:
Becuase he did not want to scare the people while he was oing his job
Explanation: