In chlorophyll b functional group is?

Aldehyde group

Explanation:

The two chlorophylls differ only at position 3 (ring B): chlorophyll a contains a methyl group at this position, whereas chlorophyll b contains an aldehyde group (1).

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.

straight probes are used primarily for measuring flow as it is approaching the test area. its geometry allows the probe to be mounted so that it is in the direct line of airflow.