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77julia77 [94]
3 years ago
7

At what point during the life cycle could some mollusks be considered parasites?

Biology
1 answer:
weqwewe [10]3 years ago
5 0

Answer:

I would say at larva stage.

Explanation:

This is because the eat microscope things at this stage.

If you have any questions feel free to ask in the comments - Mark

ALSO Happy Valentines Day ❤

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4 years ago
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A scientist wanted to see if the number of eggs in a nest varied according to latitude. She decided to study a specific species
77julia77 [94]

Answer:

A. Does the number of eggs in a nest of this bird species vary with the latitude of the area the bird lives in?

B. The latitude of the area

C. The number of eggs

D. The species of the bird

E. The number of the bird eggs in a nest in a temperate zone area will be greater than that of a tropical area.

F. 600 nests

G. The number of eggs

Explanation:

A. In the investigation, the scientist wanted to see if the number of eggs in a nest varied according to latitude, therefore, the question she will be seeking an answer to is: does the number of eggs in a nest of this bird species vary with the latitude of the area the bird lives in?

B. The independent variable is the variable that is not affected by the other variables being measured in an investigation. In the investigation by the scientist, the latitude of an area is the independent variable in that it is independent of changes in the other variable- the number o eggs- in the investigation.

c. The dependent variable is the variable that is affected by changes to the other variable in an investigation. The number of eggs is expected to vary according to latitude, is therefore, it is the dependent variable.

D. The constant is the factor that does not change during the experiment. The bird species is the constant as it does not change in the investigation.

E. A hypothesis is a specific statement predicting the result of an investigation or study.

In this study, the hypothesis could be: The number of the bird eggs in a nest in a temperate zone area will be greater than that of a tropical area.

F. The sample size gives the the total number of subjects,  individuals or observations in a study. In this case, the subjects are bird nests, and the sample size is 600 nests.

G. The number of eggs in all the nests were counted; therefore, it is the repeated measure.

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3 years ago
The antiparallel arrangement within DNA molecules refers to Select one:
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Answer:

c. one helix strand that runs from the 5' to 3' direction and the other strand runs from the 3' to 5' direction.

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A DNA molecule has <em>two strands of nucleotides with a sugar phosphate backbone each, but orientated on the opposite direction </em>allowing for the base pairs to complement one another, making it a more stable structure. <em>When two biopolymers run parallel to each other but with opposite directionality (alignment) we have an antiparallel arrangement.</em>

I annexed an image of the DNA structure.

I hope you find this information useful and interesting! Good luck!

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