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2 years ago

3. How has the distribution of forests changed over time in the United States? STT

1 answer:

azamat2 years ago

5 0

Between 2015 and 2020, the rate of deforestation was estimated at 10 million hectares per year, down from 16 million hectares per year in the 1990s. The area of primary forest worldwide has decreased by over 80 million hectares since 1990.

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The hip bone of a whale and the appendix of a human are referred to as ______because they have little current importance but wer

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C. vestigial structures

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3 years ago

Some peeled pieces of apple were placed in distilled water and some in very salty water. The cells in the apple pieces will

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I think that they will g<span>ain water in the distilled water and lose water in salty water. I think water will be lost because salt is used as an drying agent, it is why when it snow they will put salt on ice to keep the ice from being slippery because it dries things up. Distill just means to purify something.</span>

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3 years ago

3. In a field of sugar beets in Georgia the net primary productivity is 120 grams/m^2/day, and the

konstantin123 [22]

Answer and Explanation:

Available Data:

1 gr beets = 2,000 cal

NPP = GPP – Respiration = 120 grams/m2/day

NPP= Net primary productivity of a system

GPP= Gross productivity of the producers

Respiration loss 25% of NPP

Insolation energy is 800 calories/cm2/day

% Efficiency of Photosynthesis = (NPP/Insolation Energy) X 100

1) Find the gross productivity of the sugar beets.

We need to calculate the GPP, which equals NPP - Respiration rate. The respiration loss is 25% of the NPP. This is:

100% NPP--------------- 120 g/m²/day

25% NPP ----------------X = (25 x 120)/100 = 30 g/m²/day

Now that we know the values of NPP and respiration rate, we can calculate the GPP.

GPP = NPP - Respiration

GPP = 120 (g/m²/day) - 30 (g/m²/day)

GPP = 90 g/m²/day

GPP = 0.009 g/cm²/day

2) Using the NPP, calculate the efficiency of photosynthesis for the sugar beets.

% Efficiency of Photosynthesis = (NPP/Insolation Energy) X 100

We know the NPP, but this value is calculated in g/m²/day, while the Insolation energy is in g/cm²/day. We need to calculate the % Efficiency of Photosynthesis in cm. To do that, we must transform the information.

So if 1 m² = 10,000 cm², then:

10,000cm²----------120 grams/m²/day NPP

1 cm²---------------- (1 x 120) / 10,000 = 0.012 grams/cm²/day NPP

We also know that 1 gr beets = 2,000 cal, and that the Insolation energy is 800 calories/cm²/day

So we need to transform Insolation energy from calories/cm²/day to grams/cm²/day, so:

2,000 calories ----------------- 1 gr beet

800 calories/cm²/day---------X = 0.4 gr beet.

% Efficiency of Photosynthesis = (NPP/Insolation Energy) X 100

% Efficiency of Photosynthesis = (0.012 (gr/cm2/day) /0.4 (gr/cm2/day)) X 100

% Efficiency of Photosynthesis = 3 gr/cm2/day

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3 years ago

BRAINLIEST!! According to embryology, why do fish and birds have a common ancestor?

Blizzard [7]

Answer:

Both fish and bird embryos exhibit gill slits and a tail.

Explanation:

According to embryology, all vertebrates exhibit similar traits and structures at their embryonic stage. It becomes very difficult to differentiate between the embryos of a fish, and that of a bird, or embryo of a fish, and a human. These traits, however, disappear, as the case may be, as the embryo develops into an adult. For example, in the case of the embryo of a fish, and a bird, both shows gills slits at their respective embryonic stage. However, the gill slits in fish develop into gills, whereas in the case of birds, it disappears as the embryo develops into an adult.

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The table shows the relative size of the genomes (total DNA in the nucleus), number of genes, and number of chromosomes for a va

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A bacteria has a small genome. perhaps it has about 5000 genes. it also has 1 chromosome.

Yeast are more complicated than bacteria. Saccharomyces cerevisiae (the yeast that makes beer, wine and bread, has about 6300 genes and 16 chromosomes.

A human has 46 chromosomes (23 pairs), and has likely around 20,000 genes.

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3 years ago

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