The snowy owl lives in the tundra, a cold biome in north america. in the year 2000, there were 200 snowy owls in a sample of the tundra. in the year 204, there were only 126.
calculate the change in the snowy owl population size

Explanation:

In 2000 there were 200 snowy owls and in 2004 there were 126 snowy owls .

so, the number of snowy owls decreased is : (200-126)

= 74

now this number has decreased in 4 years . so per year decrease is : (74/4)=18.5

18.5

Explanation:

We are given that there were 200 snowy owls at first and then after four years, the population dwindled to 126.

The difference is 200-126, or 74.

There was a gap of 4 years, and it's a constant rate, so our answer is 74/4, or 18.5.

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.