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
yuradex [85]
4 years ago
13

Ned is designing an experiment to test which hand sanitizer kills the most E. coli bacteria. In order for Ned's results to be va

lid, what must he do? A. test each hand sanitizer on different days and at different times of the day B. test the first brand of hand sanitizer on E. coli bacteria, then test the second brand of hand sanitizer on a sterilized Petri dish C. test the hand sanitizers on bacterial colonies that are kept in the exact same environmental conditions, such as temperature and light level D. test the hand sanitizers first on E. coli bacteria and then on other bacterial species
Biology
1 answer:
SVETLANKA909090 [29]4 years ago
7 0

test the hand sanitizers on bacterial colonies that are kept in the exact same environmental conditions, such as temperature and light level

You might be interested in
When two different species live in the same area and use the same limited resources?
S_A_V [24]
Community I believe is the term
8 0
3 years ago
Explain in words the semi conservative model of DNA replication. In your answer make sure you include the end result and explain
kati45 [8]
DNA replication is said to be semi-conservative because of this process of replication, where the resulting double helix is composed of both an old strand and a new strand. ... Semiconservative replication would produce two copies that each contained one of the original strands and one new strand.
5 0
3 years ago
The human respiratory system consists of various organs that work together to accomplish the vital task of bringing oxygen into
Olegator [25]

Answer:

C) esophagus - moves air from the nose into the lungs

Explanation:

The oesophagus is a muscular tube with a sphincter valve at each end. Its main function is to transport food and fluid, after being swallowed, from the mouth to the stomach.This is propelled from the pharynx into the oesophagus, and towards the stomach in a peristaltic waves. The peristalsis also pushes food along the alimentary canal

4 0
3 years ago
The bottleneck effect is used to describe an event where a population decreases. One example involves the northern elephant seal
Svet_ta [14]
I think the best phrase to describe this would be Founder effects. Founder effects occurs when a new colony is started by a few members of the original population. This small population size means that the colony may have; a non-random sample of genes in the original population. Reduced variation from the original population.. According to Bottlenecks and founder effects, genetic drift can cause big losses of genetic variation for small populations.
5 0
4 years ago
Read 2 more answers
How does sunscreen work
Mashcka [7]
Sunscreen works by blocking and absorbing UV rays through a combination of physical and chemical particles. Physical particles, such as zinc oxide and titanium dioxide, are used to reflect UV radiation from the skin.
5 0
3 years ago
Read 2 more answers
Other questions:
  • two rows of transition metals are placed at the bottom of the periodic table to save space. elements in the first row are called
    7·1 answer
  • how would a variety of organic compounds be different if carbon had seven electrons in its outermost energy level instead of fou
    14·1 answer
  • What do alcohol fermentation acetyl COA formation and the kerb cycle have in common
    12·2 answers
  • Which of the following consists of an amino group, a carboxyl group, and a
    15·1 answer
  • What is the thing called that mystery solvers use to spray around for fingerprints called?
    12·1 answer
  • In what depth of water would a wave begin to breakif it had a wave height of 3 meters
    8·1 answer
  • The weed that grows and live on other plant is what
    8·2 answers
  • Both animal fats and plant oils are made up of glycerol and............................
    6·1 answer
  • Are physical characteristics of an organism not genetically passed down?
    12·1 answer
  • Cystic fibrosis is a genetic disorder. It is a recessive trait that is determined by two alleles. Suppose two parents each carry
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!