1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
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:

You might be interested in
What is the probability of producing a tall pea plant from a genetic cross between two hybrid tall pea plants?
horrorfan [7]

answer: 3/4 , 75 percent

5 0
3 years ago
What is the purpose of operons in prokaryotes?
Tems11 [23]
The operon is effectively the center of transcriptional control. In addition to its main structural genes, the operon houses an operator and a promoter. In front of the promoter lies a regulatory gene that produces repressor proteins. When a repressor is in its active state, it binds to the operator.
Hope this helped.
4 0
3 years ago
The earths interior heat and pressure drivedl a proccess of heat transfers in the mantle called
Sergeeva-Olga [200]

Mantle convection describes the movement of the mantle as it transfers heat from the white-hot core to the brittle lithosphere. ... Convection currents also transfer denser, cooler material from the crust to Earth's interior through the process of subduction.Aug 11, 2015

4 0
3 years ago
Sam had a disease that weakened his heart so it could not pump properly. This heart problem
Kamila [148]

Answer:

2.  muscular system and cardiovascular system

6 0
3 years ago
I need help with this astronomy problem thanks? Imagine a photon of light traveling the different paths in the Milky Way describ
Slav-nsk [51]
Longest to Shortest:

<span>across the diameter of the galactic halo -  200,000 light years
</span><span>across the diameter of the galactic disk -  100,000 light years
</span><span>from the sun to the center of the galaxy - 26,000 light years
</span><span>across the diameter of the central buldge - 20,000 light years
</span><span>through the disk from top to bottom - 1,000 light years.</span>

3 0
3 years ago
Other questions:
  • Which sequence best summarizes lactic acid fermentation?
    7·2 answers
  • TRUE or FALSE: The seasons are caused by the tilt of the Earth’s axis. A. FALSE B. TRUE
    12·2 answers
  • Explain how digestion takes place in the ruminant(cow)<br>​
    5·1 answer
  • HIV acts by attaching to receptors on the surfaces of T-cells that aid other lymphocytes in fighting infection. Once HIV is insi
    15·2 answers
  • What is a genetic code??
    6·1 answer
  • What is the equation for photosynthesis ~ Branliest
    8·2 answers
  • Cold case files recently began re-investigating an old murder case. The murder took place in the park; a young man, James, was h
    12·2 answers
  • Guys, I know this is not homework related and I am aware so please do not report Please I am begging you I am doing a google cla
    11·2 answers
  • Need help. brainliy to the first person that answers is right telling why
    13·1 answer
  • What is an organic molecule that consists of C, H, O atoms in a ratio of 1:2:1
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!