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
lukranit [14]
3 years ago
6

What do the four R’s mean

Biology
1 answer:
saveliy_v [14]3 years ago
7 0

Answer:

Reduce, Reuse, Recycle and Recover are the four R’s.

REDUCE: This means to use the environmental resources in a sustainable way and prevent waste.

REUSE: This means we can use the same thing over again.

RECYCLE: This means things are processed and can get turned into some other product that they can be used again.

RECOVER: This means a safe and eco-friendly alternative should be used in place of a thing.

You might be interested in
What happens during gas exchange?
Misha Larkins [42]

Red blood cells exchange carbon dioxide for oxygen

7 0
3 years ago
Read 2 more answers
Research this week will be done over the Nervous System
erik [133]

Answer:

The major organs of the nervous system are the brain, spinal cord, sensory organs, and all of the nerves that connect these organs together.

The nervous system reacts to the presence of danger(instinct), stores memories, control the 5 senses, and commands the rest of the organ systems to maintain homeostasis.

The nervous system works together with the respiratory system, the circulatory system, the muscular system, and many more.

8 0
3 years ago
in humans, a combination of XX chromosomes results in a female zygote and that of XY result in a male zygotes. From whom does th
devlian [24]
The answer is: from mother

In a human diploid somatic cell (2n), there are<span> in total 46 chromosomes</span> - 22 autosomal chromosomes present in two copies and 1 pair of sex chromosomes. This means there are 23 pairs of chromosomes. In males, there is one X and one Y chromosome (XY) while in females, there are two XX chromosomes (XY).
During the formation of gametes, a female could give only X chromosomes, so gametes from the mother contain one X chromosome. But, a male could give X or Y chromosome, so gametes from the father contain either X or Y chromosome.
Female gamete and male gamete fuse to form a zygote. Male zygote must contain both X and Y chromosome. It inherits Y chromosome only from the father, so X chromosome must be inherited from the mother.
6 0
3 years ago
• What types of muscles are in the body?
Tems11 [23]

Answer:

I don't know I'm sorry I will tell you another answer asks me

6 0
3 years ago
Read 2 more answers
The process of making changes in the DNA code of a living organism is called
hram777 [196]
It is called genetic engineering
5 0
3 years ago
Other questions:
  • Helpppppppppppppppppp
    5·2 answers
  • What region is distal to the umbilical region
    13·1 answer
  • Identify and describe the soil found in the tundra
    13·1 answer
  • Proteins are used to enable movement, provide structure and support and carry out important chemical reactions inside the body.
    11·1 answer
  • Describe the arrangement of the water molecule to molecule with one <br> another
    12·1 answer
  • Estrogen has a direct effect on the
    15·1 answer
  • Which of the following would make the BEST conductor? a.) water
    14·2 answers
  • How is the lymphatic system related to the cardiovascular system
    5·1 answer
  • How is cancer related to the cell cycle?
    5·1 answer
  • The main site of secretion of all substances, except for one, is the proximal convoluted tubule. What is the one substance that
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!