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GaryK [48]
3 years ago
10

Please help!!!!! Thanks!! I'll make you Brainliest!!

Biology
2 answers:
raketka [301]3 years ago
3 0
I belive the correct answer is a
Temka [501]3 years ago
3 0
The correct answer is A.
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The color of a star is primarily determined by its _____. composition size apparent brightness age surface temperature
VLD [36.1K]
The color of a star is primarily determined by its surface temperature.

For example, the really hot stars, called White Dwarf stars, have a white surface temperature, while a cooler star would have a more red color.
6 0
3 years ago
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A food chain contains oak trees (producer), mice (herbivore), black rat snakes (carnivore), and bald eagles (carnivore). How man
VMariaS [17]

Answer:

It has 4 trophic levels.

Explanation:

The first level would be the producers, followed by the primary consumers, then the secondary consumers, then the tertiary comsumers.

              /    Tertiary consumers          \

           /   Secondary Consumers           \

        /    Primary Consumers                     \

     /           Producers                                   \

 /________________________________\

5 0
3 years ago
Match the chemical signal with the appropriate description.
Lyrx [107]
<span>a. chemicals produced by neurons that function as hormones—neurohormones
b. chemicals that act locally on nearby cells—paracrine factors
c. chemicals secreted by presynaptic terminal—neurotransmiters
d. influences same cell type from which it is secreted—autocrine agent
e. chemical secreted into the blood by specialized cells; travels some distance to target tissues—endocrine hormones</span>
3 0
2 years ago
A crayfish’s swimmerets are used only for swimming.<br> a. True<br> b. False
marta [7]
Its false because lobsters have swimmerets as well and they dont use them only for swimming
6 0
3 years ago
Echinoderms _____. _____ Select one: a. have an exoskeleton of hard calcareous plates b. often use tube feet to move around in t
atroni [7]

Answer:

B. often use tube feet to move around in their environment

Explanation:

Tube feet are tiny tubular projections of echinoderms on the underside (oral side). They are a member of the echinoderm water vascular system.

Tubular feet are used for feeding, breathing and shifting. They are arranged around the sides, in grooves. They work by hydraulic pressure. They are used to transfer food in the centre to the oral mouth, and may stick to surfaces. Tube feet allow certain animals to stick and travel slowly to the ocean floor. for example starfish uses tube feet for the above functions.

Hence, the correct option is B.

4 0
3 years ago
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