A population of snakes has 900 individuals. They have a death rate of 30 per year and a birth rate of 20 per year. Assuming 6 snakes migrate into the population and 3 migrate out of the population per year, how many individuals would there be after the first year? (To answer, write numerals in the box below.)


Answer 1


893 snakes after first year


total population= 900

death = 30 per year    left=  900-30= 870

birth each year= 20 per year      so 870 +20= 890 snakes

6 snakes migrate into the population = 890 + 6= 896 snakes

3 migrate out of the population per year = 896-3= 893 snakes

Answer 2

Final answer:

After accounting for annual birth rate, death rate, and net migration, the snake population after one year would be 893 individuals.


To find out how many individuals are in the population after the first year, we start with the initial count of 900 snakes. We then subtract the death rate, or number of snakes dying per year (30), add the birth rate, or number of snakes being born per year (20), then also add the net migration, or difference between snakes moving into and out of the area (6 entering - 3 exiting = 3 net influx).

So the calculation would look like this: 900 (initial population) - 30 (death rate) + 20 (birth rate) + 3 (net migration) = 893

Therefore, after one year, there would be 893 snakes in this population.

Learn more about Population Dynamics here:



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You observe a population of Island Sparrows for which the phenotype of crown color varies from yellow to white. You perform two experiments. Experiment 1 shows that this variation in the phenotype affects mating success, so that birds with yellow crown colors have more offspring. Experiment 2 shows that this variation in phenotype is determined fully by the diet of the birds and not genetics. Crown color will evolve via natural selection in this population of Island Sparrows.1. True
2. False



yes true Crown colour evolves by natural sselection.


  • From Experiment 2, it is clear that the color of the crown does not depend on the genes. It depends only on the food taken by the sparrow. Experiment 1 proves that yellow people have higher reproductive success. Those with yellow crowns have good skills in finding food. Depends on hunting / feeding vision, hunting skills, body muscles, etc. These genes are determined in whole or in part.
  • The Yellow Crown Sparrow contains the gene for their offspring. These offspring get genes that are very good at finding food so that they can get the food they need. They need a yellow crown. Ends
  • White-crowned sparrows are not good at finding food. They produce a small number of offspring that are not enough to find food. Lack of proper food, resulting in a white crown, results in a small number of offspring.
  • Over time the sparrow crown develops in the yellow direction. This is due to differences in hunting / feeding skills. This difference leads to natural saliva.

Multiple ChoiceWhich of the following sets of terms could be used in a description of the peripheral nervous system?
A. Motor neurons and sensory neurons
B. Brain and spinal cord
O C. Motor neurons and brain
O D. Sensory neurons and spinal cord



B. Brain and spinal cord


because we need both in order to survive and work properly.

Scientists construct an experimental bacteriophage that is composed of the T2 phage protein coat and T3 phage DNA. If a bacterium is infected by this phage, the new phages produced would be expected to have:


T4 protein and T4 DNA


  • A bacteriophage is an infection that attacks bacteria. At the point when the tail strands identify an objective host the bacteriophage  to the cell, injected  its DNA, and utilizations the microscopic organisms' apparatus to reproduce.
  • T4 is a sort of bacteriophage that infects of  E. coli.  
  • The bacteriophage T4 capsid is a prolonged icosahedron,120 nm long and 86 nm wide, and is worked with three essential proteins such as  gp23*, which shapes the hexagonal capsid cross section, gp24*, which structures pentamers at eleven of the twelve vertices.
  • gp20, which frames the extraordinary dodecameric entry vertex through which DNA.  
  • T4 DNA Ligase is ligation catalyst which utilized the parts of DNA by the catalyzing between  compared 5'phosphate and 3' hydroxyl endsand phosphodiester bonds in the double stranded DNA  utilizing ATP as a coenzyme.

How many moles are in 17.13g of MgO



0.4250 mol MgO

General Formulas and Concepts:

Chemistry - Atomic Structure

  • Reading a Periodic Table
  • Using Dimensional Analysis


Step 1: Define

17.13 g MgO

Step 2: Identify Conversions

Molar Mass of Mg - 24.31 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of MgO - 24.31 + 16.00 = 40.31 g/mol

Step 3: Convert

17.13 \ g \ MgO((1 \ mol \ MgO)/(40.31 \ g \ MgO) ) = 0.424957 mol MgO

Step 4: Check

We are given 4 sig figs. Follow sig fig rules and round.

0.424957 mol MgO ≈ 0.4250 mol MgO

Drosophila melanogaster have four pairs of chromosomes.a.what is the ploidy level at metaphase ii of meiosis?

a. 8n

b. 1n

c. 4n

d. 2n

e. 0n

b.what is the ploidy level at prophase of mitosis


The answer is d. 2n

Drosophila melanogaster have four pairs of chromosomes, so the normal cell would have 4n(four pairs) of chromosome. metaphase is the phase of cell division where the chromosome start to lining up in the middle. In meiosis II, the chromosome is already divided into half, so the total chromosome of the cell would be 2n(half of the 4n)

Which ingredient is a product of photosynthesis? Sugar, sunlight, carbon dioxide, or water?





plant converts ATP to sugar