True or false paleolithic people probably lived in small nuclear family units

Biology

1 answer:

skad [1K]3 years ago

7 0

The given statement is false, as Paleolithic people thrived in the groups of 20 to 30 individuals.

At the time of Paleolithic, the hominins gathered together in brief societies, like bands, and survived by fishing and gathering plants, scavenging or hunting wild animals. The Paleolithic era is featured by the application of knapped stone tools, however, tools made up of woods and bones were also used by humans at that time.

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Which molecules of the adaptive defense system provide humoral immunity by circulating freely in the blood and lymph, where they

alisha [4.7K]

Answer:

Adaptive immune defense system consists of lymphocytes like B-lymphocytes and T- lymphocytes. B-lymphocytes provides humoral immunity while T- lymphocytes provide cell-mediated immunity to the body.

99% of lymphocytes circulate freely in the blood and lymph. B lymphocytes differentiate into plasma B cells and B memory cells when interact with antigen presented by T helper cells.

Then plasma cells secrete antibodies in the circulation which binds to extracellular antigens through antigen-binding site. Then the bounded antigen is recognized by receptors present on phagocytic cells. This receptor binds the Fc region of antigen bounded antibody and destroy the antigen by phagocytosis.

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Which of the following stages of the water cycle is most likely to be occurring on a clear Sunny hot day

Anettt [7]

Evaporation

Explanation:

On a hot sunny day, the stage of water cycle most likely occurring is the evaporation stage.

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