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
Aleksandr-060686 [28]
3 years ago
13

Which of the following lists the steps of technological development in the

Biology
2 answers:
Nataliya [291]3 years ago
8 0

Answer:

C. (1) Telegraph; (2) telephone; (3) cordless telephone; (4) mobile

phone

Explanation:

Telegraphs were used as a source of communication in very early days. Telegraph is a device which uses electrical signals to transmit messages across long distances and it was invented in 1830.

Telephone is another communication device which was first used in 1876. It is an electronic device which is stationary and fixed at a position through wiring and it is used for communications across short or long distances.

After telephone, cordless telephone came into existence as an advanced form of telephone because cordless is not fixed at a location through wiring and it could be moved from one place to another <u>within a short range.</u> It was first introduced in 1995.

Mobile phone is the most advanced type of telephone used for communication and they are not fixed at a position. People can carry mobiles with them even if they are travelling across long distances. They first came in use in recent years.

allochka39001 [22]3 years ago
7 0
The answer is D. Telegraph, telephone, cordless phone , mobile
You might be interested in
In cattle, codominance of the allele for a red coat (R) and the allele for a white coat (W) results in offspring with a roan coa
mario62 [17]

Answer:

Genotype ratio: 1 (RR) : 2 (RW) : 1 (WW)

Phenotype ratio: 1 Red : 2 Roan : 1 White

Explanation:

Codominance is a kind of inheritance pattern in which both alleles are equally dominant in a gene. This means that both alleles when in a heterozygous state will be simultaneously expressed. According to this question, allele for a red coat (R) and the allele for a white coat (W) results in offspring with a roan coat (RW) in cattle.

Hence, in a cross between a a roan cow (RW) and a roan bull (RW), the following gametes will be produced: R and W.

Using these gametes in a punnet square (see attached image), the offsprings with the following genotypes will be produced: RR, RW, RW, WW.

Therefore, based on the results of the cross;

Genotype ratio: 1 (RR) : 2 (RW) : 1 (WW)

Phenotype ratio: 1 Red : 2 Roan : 1 White

7 0
3 years ago
PLEASE HELP!!!
LUCKY_DIMON [66]
  • Parent material. Few soils weather directly from the underlying rocks. ...
  • Climate. Soils vary, depending on the climate. ...
  • Topography. Slope and aspect affect the moisture and temperature of soil. ...
  • Biological factors. Plants, animals, micro-organisms, and humans affect soil formation.
<h2>__________________</h2><h2>FOLLOW ME</h2>
7 0
3 years ago
An ecosystem is a community of organisms at a global level <br><br> True or False
const2013 [10]

Answer:

True

Explanation:

Hope this helps

4 0
2 years ago
Which statement best describes a keystone species
professor190 [17]

The answer is D

One way to remember this is when you are building a bridge there is one piece right in the middle that keeps the whole thing from collapsing that is called the key-stone. If a keystone species goes extinct then the rest of the ecosystem will crumble around it.

5 0
2 years ago
Read 2 more answers
A commonly used medication to treat hypothyroidism is 
Firlakuza [10]
The answer is (B. levothyroxine)
8 0
3 years ago
Other questions:
  • The term osteoid refers to the organic part of the matrix of compact bones. the term osteoid refers to the organic part of the m
    15·1 answer
  • What are three terms to describe organisms such as cows
    10·1 answer
  • A certain reptile species is a carnivore and lives only on an isolated island. Which of the
    10·1 answer
  • Homologous structures are those that:
    6·2 answers
  • What unusual event occurs during El Niño?
    7·2 answers
  • Which statement is supported by the diagram
    8·1 answer
  • I need help for 3!! please help
    5·1 answer
  • Select the correct statement about the neural mechanisms of respiratory control. A. The ventral respiratory group is contained w
    12·1 answer
  • Species in which dark brown fur (D) is dominant relative to light brown fur (d). Using the Punnett square below, predict the fre
    13·1 answer
  • A skeletal muscle's partially contracted state that is normal even when the muscle is not in use is called
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!