In what era did single-celled organisms like bacteria form? WORTH 20 POINTS

Biology

1 answer:

Fantom [35]3 years ago

8 0

Answer:

3.5 billion years ago, or in the Eoarchean Era.

Explanation:

The first known single-celled organisms appeared on Earth about 3.5 billion years ago, roughly a billion years after Earth formed. More complex forms of life took longer to evolve, with the first multicellular animals not appearing until about 600 million years ago.

The earliest undisputed evidence of life on Earth dates at least from 3.5 billion years ago, during the Eoarchean Era.

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True or false? B cells were originally isolated from the bursa in chickens

Maru [420]

Answer:

True

Explanation:

B cells are B lymphocytes and are one of the types of white blood cells. Their main role is in the acquired immune system in which they help in the humoral immune response of the body by the secretion of antibodies. The maturation of the B cells occurs in the bone marrow in mammals. But in birds, these cells mature in an organ named bursa of Fabricius which is a lymphoid organ in birds. These B cells were first isolated form the bursa of Fabricius of the birds.