A true
<span> Before agriculture was developed people mostly were nomadic in nature. They moved from place to place in search of food. Some of them were groups of hunter gatherers as well. When agriculture started people also started to settle down in groups. This led to the development of civilization and in modern day cities and towns. The first agricultural practices were started beside the river banks due to the reason that the soil was very fertile and water for irrigation was also easily available. </span>
Ecological balance always require that there must be more producers than the number of consumer. When the equation for ecological balance will be reverse there will be ecological imbalance which is called the disturbances. This will later on cause the scarcity of resource and extinction of one species.
Answer:
A. Layer of soil that always stays frozen
Answer:
G-protein subunits bind to the receptor
GTP binds to the alpha subunit replacing GDP
G-protein subunits separate from the receptor
alpha subunit separates from other two subunitsalpha subunit-GTP complex alters cell activity
Explanation:
5 2 3 4 1
