Explanation:
The answer is Electromagnetic Waves
The answer is B. Vascular plants and invertebrates appeared during this time.
Answer is the first option, Fossil fuels release carbon dioxid, a greenhouse gas, as they burn.
Explanation:
D. It led to the development of nonrenewable sources of energy.
Answer:
c. become capable of human-to-human transmission.
Explanation:
- The H5N1 flu virus is a virus that is capable of causing infectious respiratory disease in birds and hence, it is an avian influenza virus and the infection caused by it famously known as bird flu.
- When it comes to humans, the humans may acquire the infection from consuming or being in close contact with infected birds however, the incidences of the human pandemic are rare.
- The reason for fewer chances of a human pandemic is because for such a pandemic to occur person to person spread is needed which does not happen in case of bird flu.