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dem82 [27]
3 years ago
14

Explain how the water vascular system allows an echinoderm to move along the ocean floor. Please help!

Biology
2 answers:
meriva3 years ago
4 0

Water gets into the water vascular system through an opening in the echinoderm's body. When the animal contracts its muscles, the water is forced through the system and into the tube feet. The tube feet act as suction cups, gripping the surface below. When the echinoderm retracts its muscles, the tube feet retract and let go of the surface. This series of contractions and retractions allows the animal to move along the ocean floor.

edge

astra-53 [7]3 years ago
3 0

Answer: Sea stars move using a water vascular system. Water comes into the system via the madreporite. It is then circulated from the stone canal to the ring canal and into the radial canals.

Explanation: The radial canals carry water to the ampullae and provide suction to the tube feet.

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You are doing lab work with a new species of beetle. You have isolated lines that breed true for either blue shells and long ant
aev [14]

Answer:

Due to the fact that when crossing the isolated lines, the F1 progeny expression resulted in all alleles having blue shells and long antennas,  the dominant <em>shell/color & length/antenna</em> combination is:

<em>"</em><em>Blue Shell & Long Antenna</em><em>"</em>

8 0
3 years ago
Two groups of tomatoes were grown under laboratory conditions, one with humus added to the soil (Group 1) and the other a contro
charle [14.2K]

Answer:

the humus contains the minerals necessary for chlorophyll synthesis

Explanation:

<em>The yellowness of leaves in plants can be attributed to inadequate chlorophyll in the plant</em>. The chlorophyll is responsible for the greenness appearance of the leaves of plants and when it is present in inadequate quantity, the leaves appear yellowish in color.

<u>Some of the minerals necessary for the formation of chlorophyll include magnesium, nitrogen, and iron</u>. It thus means that the humus supplied to the soil of group 1 plant has the necessary minerals to synthesize chlorophyll while the soil of group 2 plants is deficient in some or all the minerals required for chlorophyll synthesis.

8 0
3 years ago
What types of rocks do the numbers 2, 3, and 5 represent, in that order?
Stels [109]

Answer:

d) sedimentary, metamorphic and igneous

8 0
3 years ago
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How long does it take the moon to go through all of its phases
polet [3.4K]

Answer:

27 days

Explanation:

It takes 27 days, 7 hours, and 43 minutes for our Moon to complete one full orbit around Earth. This is called the sidereal month, and is measured by our Moon's position relative to distant “fixed” stars. However, it takes our Moon about 29.5 days to complete one cycle of phases (from new Moon to new Moon).

4 0
3 years ago
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Describe ways to produce meat more efficiently, humanely and sustainably. How can we make aquaculture more sustainable. Define o
vredina [299]

Answer: 1. Ways to produce meat more efficiently.

1. Livestock farming

2. Ranching

3. Grazing

2. Ways to make agriculture more sustainable

1. Practicing crop rotations.

2. Planting of cover crops.

3. Elimination and removal of soil tillage.

4. Practicing pest management.

5. Integration of livestocks and crops.

3. Organic Agriculture; this is a system of production that helps sustains the fertility of soils, ecosystems and it's people.

Advantages of organic agriculture

1. Reduction in production costs due to absence of expensive chemicals and fertilizers.

2. Farm workers are healthier.

3. Saves energy.

4. Environment protection.

4. Advantages of relying on perennial crops

1. Perennial crops have better access to groundwater due to their deep roots.

2. They require less irrigation.

3. They are more resistant to drought.

4. They help protect topsoil from erosion, runoff, and lose of nutrients which helps make the land fertile for agricultural purposes.

Explanation: meats can be produced more humanely and sustainably by practicing livestock farming and grazing.

The word organic means natural no chemicals or addictive organic farm produce are usually fertilised using animal waste and dungs.

By practicing crop rotation, the soil becomes more fertile unlike when one crop is planted continuously.

Perennial crops help repair our farmlands, unlike annaul crops. They protect the topsoil.

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3 years ago
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