BIOLOGY MIDDLE SCHOOL

Sand dollars are radially symmetrical and have an internal skeleton but no backbone. Which phylum do sand dollars belong in?A) chordates
B) echinoderms
C) arthropods
D) mollusks

Answers

Answer 1
Answer:

Sand dollars are radially symmetrical and have an internal skeleton but no backbone. This belongs to echinoderms.

What is echinoderms?

Echinoderms are known for their radial symmetry and pentamerous bodies (five or more limbs, typically grouped two on the left, one on the middle, and two on the right).

The body is divided into five equal sections, each of which has a duplicate set of different internal organs. Although brittle stars lack a heart, brain, or eyes, some of them appear to have light-sensitive areas on their arms.

Echinoderms have tube feet, which resemble tentacles and have suction pads at the ends. The extraordinary vascular system that controls these tube feet hydraulically.

Therefore, Sand dollars are radially symmetrical and have an internal skeleton but no backbone. This belongs to echinoderms.

To learn more about echinoderms, refer to the link:

brainly.com/question/1200652

#SPJ5
Answer 2
Answer: Hello there. ^-^

Sand dollars are radially symmetrical and have an internal skeleton but no backbone. Which phylum do sand dollars belong in?

B) echinoderms

Related Questions

In which structure would you find a nucleus
PLEASE HELP I'll MARK THE BRAINLIEST1.) A vessel that carries oxygen-rich blood to the heart muscle is called a(n): *A.) Coronary ArteryB.) VeinC.) VentricleD.) Atrium2.) A group of cells that receives messages about the body's oxygen needs and sends out signals to adjust the heart rate is called the: *A.) AtriumB.) Lymph NodeC.) ValveD.) Pacemaker3.) Blood components that helps the body control bleeding are: *A.) HemoglobinB.) Red Blood CellsC.) White Blood CellsD.) Platelets4.) Plasma is mostly composed of: *A.) Blood CellsB.) WaterC.) ProteinsD.) Hemoglobin5.) Which of the following is NOT a characteristic of a vein? *A.) Valves prevent backward flow of bloodB.) Returns blood to the heartC.) Walls are one cell thickD.) Walls are generally thinner than those of arteries6.) The largest artery in the body is called the: *A.) AortaB.) AtriumC.) PacemakerD.) Coronary Artery7.) The network of vessels that returns fluid to the bloodstream is called the: *A.) Lymphatic SystemB.) VeinsC.) ArteriesD.) Circulatory System8.) Hemoglobin is a protein that binds easily to: *A.) White Blood CellsB.) OxygenC.) FibrinD.) Platelets9.) Which of the following structures pumps blood into arteries leading to the lungs? *A.) Right AtriumB.) Left AtriumC.) Right VentricleD.) Left Ventricle10.) Which of the following structures is NOT part of the cardiovascular system? *A.) HeartB.) Blood VesselsC.) BrainD.) Blood11.) True/False: The force of the heart's contracting atria causes blood pressure. *A.) TrueB.) False12.) True/False: Capillary walls must be very thick to withstand the high force of blood pumped by the heart. *A.) TrueB.) False13.) True/False: White blood cells defend the body against disease. *A.) TrueB.) False14.) True/False: Blood travels in two directions in the body. *A.) TrueB.) False15.) True/False: Blood types are determined by proteins known as marker molecules that are on red blood cells. *A.) TrueB.) False16.) Fill in the Blank: The right and left __________________ are the two lower chambers of the heart. *17.) Fill in the Blank: A sphygmomanometer is an instrument that measures ____________________________. *18.) Fill in the Blank: A flap of tissue that prevents blood from flowing backward is a(n) ______________. *19.) List two of the three main roles of the cardiovascular system: *20.) Tell me anything else that you learned in science about the cardiovascular system:
Mercury has a density of 13.5 g/cm^3. What would an object's density have to be for it to sink in mercury?
The author uses the phrase play me a tune to remember the stages of mitosis. Think of another phrase that you can use to remember the stages of mitosis.PLZ HELP! THX!
At what point do particles have no kinetic energy

A star appears to be red in the night sky. Is the star traveling toward the earth or away from the earth? How do we know this? (Hint: Think about the Doppler effect)

Answers

Answer:

The star is travelling away from the earth.

Explanation:

A star’s temperature largely determines its color. Stars with higher temperature have a bluish color and stars with low temperature appear red in color.  But the color of star that we observe from the earth is different from its actual color.

This variation in color is due to Doppler effect. When the movement of  a star is towards the earth the frequency shifts to the higher frequency region and when the movement is away from the earth the frequency of the light emitted will shift to the lower frequency region. Color of light depends on the frequency.

The color corresponding to the lower frequency region is red and color corresponding to high frequency region is blue. So when the star moves away from the earth it appears red in color.

Answer:

They appear more Blue

Explanation:

it was right this was the last question for me it is They appear more blue

A sudden shaking of Earth's crust caused by the release of energy along a fault is called a(n) _____. A. fissure B. epicenter C. earthquake D. focus

Answers

A sudden shaking of Earth's crust caused by the release of energy along the fault is called C) An Earthquake.
Answer is C. Earthquake

What the break in the lithosphere called

Answers

A break in the lithosphere is called a fault.

1. Which one lived in Antarctica earlier , the the labyrinthodont, the lystrosaurus, or the duck-billed dinosaur? Explain.

Answers

Answer is labyrinthodont

About 110 million years ago, labyrinthodonts ( maze-toothed), a group of extinct amphibians. They were evolved from lobed-finned fish in the Devonian period. They were dominant animals in the rift valley was present at that time between Antarctica and Australia.
Labyrinthodont Lived First...
Did dinosaurs once lived on antarctica?Absolutely! A theropod dinosaur named Cryolophosaurus (frozen crested lizard)
Hope I Helped plz LEave a Thanks

Genetic engineering involves____ to achieve desired resultsA. Enzyme Production
B. Modifying products and processes
C. Changing one organism into another
D. Introducing traits organisms

Answers

D. introducing traits organisms
D. Introducing traits organisms to achieve desired results

What are the most numerous types of plants

Answers

Xerophyta Viscosa, the broccoli plant, the lilac, the zucchini plant, the blue bell,and the yew bush


Hope this helps
The most numerous types of plants are the Xerophyta Viscosa, the broccoli plant, the lilac, the zucchini plant, the blue bell, and the yew bush.
Other Questions
Which group of organisms includes only multicellular heterotrophs?
What are the 3 types of blood vessels?
What are three structures a flowering plant can use to reproduce asexually?