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
serious [3.7K]
3 years ago
15

Scientific models _______.

Biology
1 answer:
Olin [163]3 years ago
8 0

Answer:

the correct answer is a

ARE BASED ON A SET OF OBSERVATIONS

hope this helps!

You might be interested in
A polygenic trait is contributed by two or more genes one gene two alleles multiple alleles
ra1l [238]
<span>A polygenic trait is contributed by two or more genes one gene two alleles multiple alleles. True!</span>
8 0
3 years ago
Read 2 more answers
In lecture, I mentioned most lakes are phosphorus limited. However, the most severely eutrophic lakes are often nitrogen limited
KIM [24]

Answer:

Phosphorus is essential for growth of plants and other organisms. When concentration of phosphorus mostly from high breeding rate e.g., pigs, cattle etc. rise in water it causes severe growth of plants and algae as well as phytoplanktons. As a results layers of phosphorus start to release phosphorus as well due to positive gradient. These reactions in water are iron-redox reactions that are crucial for the release of phosphorus.

When too much phosphorus accumulates, it produces a degrading growth feedback in plants, algae and phytoplanktons that then shift toward excessive nitrogen available from fertilizers and cause a flip from P to N. Cynobacteria now dominates and denitrification as well as nitrification takes place simultaneously.

Severe eutrophication induces hypoxia in water that cause a major damage to plants biodiversity in the environment.

5 0
3 years ago
Explain the genotypes and phenotypes of skin color. Summarize the relationship between the number of active genes and the color
kotegsom [21]

Human skin color is a polygenic trait, which means that multiple gene loci (with different alleles) are involved in its expression. It has been shown that there more than 350 genetic loci involved in determining skin color. Because of that, there is the enormous number of possible genotypes for the skin color and as a result, the phenotypes vary from the darkest brown to the lightest hues. Different populations have different allele frequencies of genes for human skin color, and the combination of these allele variations brings about complex and continuous variation in skin coloration. Natural skin color can change due to exposure to sunlight (becomes darker) and that is the way it adapts to intense sunlight irradiation (protection against the UV exposure).

plz mark as brainlist

4 0
3 years ago
What system controls the body by means of chemical molecules called hormones?
AysviL [449]
It would be the endocrine system. 
7 0
3 years ago
which sequence correctly describes the route sperm take through the human male reproduction system? a. vas deferens, urethra, ep
stellarik [79]
The route sperm take through the human male reproduction by C. Vas deference, epididymis then the Urethra.
3 0
3 years ago
Other questions:
  • 14. What are the three main parts of a eukaryotic cell?
    15·1 answer
  • While walking in the woods, you come across some low-growing plants clustered at the base of a tree. You collect one as a specim
    15·1 answer
  • It is the study of the structure and function of plant and animal cells
    11·1 answer
  • Which of the following has the greatest first ionization energy: Li,Be,B, or C?
    13·2 answers
  • How big is a bullfrog
    8·2 answers
  • Which statements best explains how mitochondria help a cell get the materials it needs?
    15·2 answers
  • How does your body get energy?
    11·1 answer
  • What does a cell copy in dna replication?
    6·1 answer
  • In 1 the options are
    8·1 answer
  • How many digestive glands are there in the body what are they? ​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!