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>
Answer:
they both have nucleus, cytoplasm, cell membrane and mitochondria
Explanation:
XX shows female
XY shows male
answer will be E as it is present on both genes.
Answer:
<h2>B) 4, 6, 7, 1, 2, 3, 5</h2>
Explanation:
Action potential ,the change in electrical potential associated with the passage of an impulse along the membrane of exciting cell. The order of steps in generation of action potential is-4.A graded depolarization brings an area of an excitable membrane to threshold.→ 6. in excitable membrane ,after that, Sodium channel get activated,→ 7. aftre that Sodium ions enter the cell and depolarization occurs,→1.after that, then Sodium channels are inactivated,→ 2. Voltage-gated potassium channels open and potassium moves out of the cell, initiating repolarization, →3. Sodium channels regain their normal properties,→ 5A temporary hyperpolarization occurs.
Answer:
From the sea to reproduce in freshwater.
Explanation:
From fisheries, we can know about many types of fishes. Anadromous is one type of fish which migrate during their life cycle.
Anadromous fish are born in freshwater in the first stage of their lives. Then they migrate to the ocean as juveniles. This migration occurs so that they grow into adults into the sea. After becoming adults, they again migrate beck into the freshwater. They reproduce into the freshwater after migrating back into the freshwater from the sea.
So, we can say that there is two migration in the whole life cycle of anadromous fishes which is occurred so that they can reproduce.
