The living and nonliving things in an area that interact with one
another and with their environment are a community.
a. true
b. false
17
Predation is a relationship in which one organism lives on, near,
or inside another organism.
a. true
b. false
18
Herbivores return matter to the environment from the bodies of dead
plants and animals.
a. true
b. false
19
Organisms that eat only plants are called omnivores.
a. true
b. false
20
The base of an energy pyramid consists only of autotrophs.
a. true
b. false

17. True

18. false

19. true

20. false

21. true

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

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clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.