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
Kruka [31]
3 years ago
12

Until the middle of the 20th century, doctors sometimes suggested that

Biology
2 answers:
Alla [95]3 years ago
6 0
Not completely sure, but maybe C.?
san4es73 [151]3 years ago
5 0

Answer:

C. Studies have shown that tobacco and tar in cigarettes have negative health effects

P. S. It is perspective and it literally explains today's situation.

P. S. It explains

You might be interested in
"The major driving forces of behavior are learning and rewards."
ankoles [38]
A comparative behaviorist
3 0
3 years ago
Read 2 more answers
What happens to the water backed off of Lake Missoula
Lesechka [4]

Answer:

It is estimated that the maximum rate of flow was equal to 386 million cubic feet per second. At that rate, the lake probably drained in a few days.

6 0
2 years ago
What are the three main factors that affect barometric (air) pressure ?
Mars2501 [29]

Answer:

Temperature

Altitude or Elevation

Moisture or water vapour.

Explanation:

8 0
3 years ago
Once an egg cell is fertilized by sperm, the cell _______.
Dovator [93]

i think its B. begins to divide and implants itself in the wall of the uterus

5 0
3 years ago
Read 2 more answers
Which form of natural selection on polygenic traits results in the creation of two distinct phenotypes? A. Directional selection
mojhsa [17]

Answer;

-Disruptive selection

Disruptive selection results in the creation of two distinct phenotypes.

Explanation;

-Disruptive selection is a type of natural selection that selects against the average individual in a population. The make up of this type of population would show phenotypes of both extremes but have very few individuals in the middle.

-The variance of the trait increases and the population is divided into two distinct groups. The disruptive selection will cause organisms with intermediate traits to reproduce less, and will allow those organisms with extreme traits to reproduce more.

5 0
3 years ago
Read 2 more answers
Other questions:
  • Is it true the environment can affect the way traits are expressed Explain
    11·2 answers
  • Where is the site of the cellular respiration for cell
    14·1 answer
  • ........................
    12·2 answers
  • in a cross between a pea plant that has smooth yellow seeds with a second plant of the same genotype, what proportion of the see
    15·1 answer
  • You discover a new organism while investigating a meteor that recently crashed. While observing it,
    10·2 answers
  • Which explanation best describes how water droplets form on the outside of a cold glass?
    9·1 answer
  • HELP DUE IN 5 MINS
    12·1 answer
  • Which of the following is NOT a function of receptors?
    8·1 answer
  • Which unit of geologic time began 65.5 million years ago and continues to the present?
    13·1 answer
  • Viruses require __________ for growth (to spread).
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!