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2 years ago

Which of the following is a producer in the food web shown above?

Biology

2 answers:

Orlov [11]2 years ago

8 0

Answer: algae

Explanation:

Algae are found in water environment. It uses photosynthesis to produce its food from carbon dioxide in the atmosphere, also in the presence of sunlight.

Unlike other options, algae is the only producer in the food web

Mekhanik [1.2K]2 years ago

5 0

The answer is C. algae because it makes it’s own food

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2 years ago

In discriminating between a viable and non-viable early intrauterine pregnancy, which one of the following criteria can be used

Alecsey [184]

Answer:

The correct answer in discriminating between a viable and non-viable early intrauterine pregnancy is B: "Mean gestational sac diameter of > 25 mm and no embryo".

Explanation:

There are different criteria used to discriminate between a viable and a non-viable early intrauterine pregnancy. The most often used to diagnose pregnancy failure are:

- Crown-rump length criterion: This is the absence of cardiac activity by the time the embryo has reached crown-rump length. A crown-rump length of 7 mm or more with no cardiac activity has been suggested by the latest studies to diagnose a non-viable pregnancy. There is a substantial likelihood that a crown-rump length < 7 mm can result in a false-positive diagnosis of pregnancy failure.

- Mean sac diameter criterion: This is the absence of embryo by the time the gestational sac has grown to a certain size. The gestational sac increases as the pregnancy progress. It has been suggested by the latest studies to use a mean sac diameter of 25 mm or more, and no visible embryo to diagnose failed pregnancy. A mean sac diameter of 16 to 24 mm and no embryo is suspicious for failed pregnancy, but shouldn’t be used to diagnose it.

- Time-based criteria: This is the absence of an embryo by a certain point in time. If an initial sonogram shows that there is a gestational sac and a yolk sac, but about 11 days later there isn’t any embryo with cardiac activity, then a failed pregnancy can be established. The timing event in early pregnancy is precise and reproducible to perform a correct diagnosis.

There are also suspicious findings that may help to identify a non-viable pregnancy. These are not certain and have not been extensively studied yet, so they cannot be used to reliably diagnose a pregnancy failure. A few of these findings are an empty amnion, a small gestational sac size, and the yolk sac size.

- Yolk sac: An enlarged yolk sac sized over 7 mm is suspicious for a failed pregnancy.

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2 years ago

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Vesnalui [34]

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