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
Andrei [34K]
3 years ago
15

How did the banned substances DDT and PCBs end up in the ocean?

Biology
1 answer:
lbvjy [14]3 years ago
5 0

Answer:

PCBs and DDT are chemicals that were banned more than 30 years ago, but our air, water, land, and bodies are so contaminated that decades of cleanup efforts have yet to eliminate their threats to our health. Today, food is one of the most likely exposure routes to PCBs.

You might be interested in
Evolutionary relationships between organisms are determined by.
Georgia [21]

Answer:

hope you like it

Explanation:

A molecular clock determines evolutionary relatedness by examining how many mutations or random changes in DNA, there are between two organisms. When we map the relatedness of different organisms, we are creating a phylogenetic tree. At some point, all organisms that are alive today shared a common ancestor.

4 0
2 years ago
Read 2 more answers
What best describes the cell theory
kirza4 [7]

The cell is fundamental unit of structure and function in living organisms .All cells arise from pre-existing cells by division . The cell theory states that the cell is the basic unit of life and that all other cells are developed from an existing cell. This theory was developed way back in the mid of 17th century.

3 0
3 years ago
Why is it not possible to completely convert thermal energy into mechanical energy
MAXImum [283]
The second law of thermodynamics is a statement of the law of conservation of energy say that heat cannot be completely converted into mechanical energy  
8 0
3 years ago
Individuals with Down syndrome have an extra chromosome 21. This is an example of which type of chromosome disorder?
Lina20 [59]
The correct answer is choice B. Nondisjunction.

Nondisjunction disorder occurs when either the homologous chromosomes or the sister chromatids fail to disconnect properly during cell division. This failure results in daughter cells with an abnormality in chromosomes. 

I hope this helps you and have an awesome day!! :)
8 0
3 years ago
Black fur in mice (
Tpy6a [65]
The answer is D) 1/2.

Let's imagine that two genes of the genotype can be analysed separately.

Black fur is determined by dominant allele B. In this case, parents Bb and BB will give offspring with only brown fur:
Parents:          Bb     x     BB 
Offspring:     BB   BB   Bb   Bb
Both homozygous (BB) and heterozygous (Bb) offspring will have black fur.

On the other hand, long tails are determined by recessive allele t. Parents Tt and tt will have 50% offspring with short tail and 50% offspring with long tail:
Parents:         Tt         x       tt
Offspring:    Tt      Tt        tt      tt
Heterozygous offspring (Tt) will have short tail, and homozygous offspring (tt) will have a long tail.

So, the offspring will definitely have black fur and will not affect the fraction of the offspring with black fur and long tails from the cross of <span>BbTt × BBtt. But, </span>there will be 2 out of 4 offspring with short tails which is 50% or 1/2. 
5 0
3 years ago
Other questions:
  • What do the equinoxes signify?
    12·2 answers
  • When an earthquake occurs, energy radiates in all directions from its source , which is called the
    9·2 answers
  • How do dolphins adapt to their habitat
    11·1 answer
  • What must be considered when determining time of death?
    7·1 answer
  • Scientists can find new discoveries that change their current understanding of scientific knowledge. True or False?
    11·1 answer
  • Which planet is made mostly of gases?
    15·2 answers
  • The process of releasing material from inside the cell
    5·1 answer
  • Which organelle maintains homeostasis in the cell?
    8·1 answer
  • eukaryotes a. are larger than prokaryotes b. have many different specialized organelles c. contains a nucleus d. all of the abov
    8·1 answer
  • Is this an underlined clause?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!