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AleksandrR [38]
3 years ago
10

Before the invention of money which system of tradewas used? *​

Biology
1 answer:
Sonbull [250]3 years ago
8 0

Answer:

A barter system is an old method of exchange. Th is system has been used for centuries and long before money was invented. People exchanged services and goods for other services and goods in return.

Explanation:

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In writing On the Origin of Species, Darwin synthesized ideas from other publications, as well as observations he made while voy
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Answer:

Principles of Geology

Explanation:

J. Henslow gifted Darwin the first volume of Principles of Geology, written by Charles Lyell. The book explains about the old age of the earth. Accordingly, the slow rate of several geological processes suggests that the earth is very old.

Darwin read the book as the ship was crossing the Atlantic and learned about geological processes occurring over the millions of years. For example, he learned that the earth's surface was not formed by some catastrophic event.

In his book, Lyell explained the slow and gradual geological processes like erosion gave rise to the vast landscapes present on the earth's surface.

Darwin compared the time taken by geological processes to form the earth's surface and reasoned if these millions of years were enough to support the evolution of species.

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Each nucleotide triplet (or 3 bases at a time) in mRNA that specifies a particular
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Answer:

B

Explanation:

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Free energy in the cell creates disorder. Cells harness free energy to drive unfavorable reactions by using Activated Carrier Mo
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G

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3 years ago
People with diabetes often receive insulin injections. What effect does insulin have on the body?
Gennadij [26K]

The right answer is B.

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In healthy subjects, insulin is secreted continuously. The body produces insulin according to the needs and foods consumed. For example, after a meal, the pancreas secretes additional insulin, allowing blood glucose to stay within normal limits.

8 0
3 years ago
Read 2 more answers
What are the products of aerobic respiration?
bixtya [17]
I am confused as to what your question is specifically asking but the chemical formula for aerobic respiration is:

Oxygen + Glucose --------> Carbon Dioxide + Water
O₂ + C₆H₁₂O₆ --------> CO₂ + H₂O

Hopefully this will aid you in answering your question :)
8 0
3 years ago
Read 2 more answers
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