Answer:
A gene pool is the stock of different genes in an interbreeding population.
Natural Selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.
Charles Darwin is a English naturalist whose scientific theory of evolution by natural selection became the foundation of modern evolutionary studies.
Explanation:
Answer:
Arthropoda, Annelida, Chordata. (Ans. C)
Explanation:
Segmentation occurs in the body plan in which recounted body units are organized along the anterior-posterior axis, because of it the body of the species is divided into segments.
Segmentation in the body structure is essential for permitting movement and the evolution of specific body parts and also helps in allow regeneration in certain species. Segmentation occurs in three phylum Arthropoda for example fruit fly, Annelida such as leech, and Chordata such as a mouse.
Answer:
Number of bacteria cells = 2621440 cells
Explanation:
The generation time of a bacteria specie is the time it takes for a population of bacteria to double in number. The generation time for most common bacteria is quite short, about 20 minutes to 1 hour.
Bacteria reproduce asexually by binary fission, in which the parent cell divides into two to produce two identical daughter cells.
In the given question, the generation time of the bacterial species is 20 minutes.
The time that have passed from between the time the sandwich was packed at 6:00 am to lunch time by 12:00 pm is 6 hours.
Using the given formula in the hint: number of cells = 2^(ab) × C
Where a = number of times per hour the bacteria reproduces; b = number of hours; C = number of bacteria at the start
a = 60 minutes/ 20 minutes = 3; b = 6; C = 10
Number of cells = 2^(3 × 6) × 10
Number of cells = 2621440 cells
Answer:
B.) Take samples from the same location each time.
Explanation:
The original answer choices to this question are the following:
- Provide details about the creatures in the "other" category.
- Take samples from the same location each time.
- Collect samples from nearby lakes for comparison.
- Use a more sophisticated net to collect smaller creatures.
Phoebe should take samples from the same location, rather than four different locations. This will overall give her more accurate and reliable results. Some areas of the lake will have more or less wildlife depending on what predators and prey live. She must have a control variable in this survey, otherwise her data will not be correct.
Hope this helps :)
Answer:
The correct answer would be she has probably already had all the strains of colds and viruses in her office.
Previous exposures to the strains of colds and viruses helped Andrea to develop adaptive immunity in her body.
Adaptive immunity helps in developing the memory against specific pathogens and thus helps in providing long-lasting protection against recurrent infections.
For example, after vaccination against a specific pathogen, our body becomes immune against that particular pathogen.