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romanna [79]
3 years ago
12

Missouri made the crinoid its official state fossil. Nicknamed the "sea lily," crinoids are actually formed by ancient sea anima

ls. What present day animals are they related to? A) manatees and whales B) sharks and dolphins C) sting rays and jellyfish D) starfish and sand dollars
Biology
1 answer:
Effectus [21]3 years ago
5 0

Answer:

✔ D)  <em>starfish and sand dollars</em>

** is the correct answer **

Explanation:

is the correct answer crinoids are echinoderms, animals with rough, spiny surfaces and a special kind of radial symmetry based on five or multiples of five.

http://geokansas.ku.edu/crinoids

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Plant cells _______.
DerKrebs [107]

Answer:. have chloroplasts and a cell wall

Explanation:All living organisms are made up of cells.some organism are made up of one cell (Unicellular) and other organism are made up of many cells(multicellular).

Cells are made up of organelles and the organelles present in a cell differ in animals cells and plant cells.

A feature that animals cells have which plant cell do not have is the presence of centrioles.

Features that plant cell have which animals cells do not have are the presence of chloroplast ,vacuole and cell walls.

Animals do not produce their food but plants do.Green Plants produce their food through chloroplast,which contains chlorophyll.

Plants has cells walls which is rigid and made up of cellulose,lignin and pectin.this rigid structure of the cell wall contributes to the rigidity of plants stems and roots.

Option A is incorrect because plant and animal cells have mitochondria.

Option B is incorrect because plants cells have both plasma membrane and cell walls.the cell wall surrounds the plasma membrane.

Option C is incorrect because plants contains Golgi apparatus and vacuole

7 0
3 years ago
A marine ecologist counts the number of crabs in three different intertidal regions that are each two hectares. The crab counts
romanna [79]

Answer:

Density is nearly 3 cabs per hectare

Explanation:

Given -

There are three three intertidal regions.

Area of each intertidal region is 2 hectares.

Number of crab in the intertidal regions are as follows -

Intertidal region I - 7

Intertidal region I - 2

Intertidal region I - 6

Sum of crabs in all three regions is equal to

7 + 2+ 6\\= 15

Total area of all three intertidal regions is equal to

2 + 2+ 2\\= 6 hectares

Now density per hectare is equal to total population of crab divided by total area of all the three intertidal regions

Density = \frac{15}{6} \\= 2.5

Density is nearly 3 cabs per hectare

5 0
3 years ago
Which list BEST identifies how the arrows should be arranged around the paper leaf in
Nataly [62]

Answer: D

Explanation:

During the process of photosynthesis the plant would use carbon dioxide, sunlight and water in order to produce and release sugar and oxygen back into the air.

6 0
3 years ago
1.) The difference in the brightness of two stars with the same surface temperature is attributable to their _____.
VMariaS [17]

Answers: 1 .The difference in the brightness of two stars with the same surface temperature is attributable to their sizes.( last choice)

2.Most responsible for the formation of a star is gravitational force.(second choice )

3. Blue ( last choice)

4.

A spinning neutron star that appears to give off radio wave pulses is called a pulsar ( third choice)

5.Greater redshifts in the spectra of galaxies indicate faster speeds ( first choice)

4 0
3 years ago
Do pollen grains have the same number of chromosomes as a regular plant cell?
finlep [7]

The pollen grain is actually the male gametophyte generation of seed plants. Inside the anther, pollen mother cells divide by meiosis to form pollen grains whose nuclei contain half the number of chromosomes characteristic of the parent plant. 

(hope that helped answer the question)

8 0
3 years ago
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