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3 years ago

How many openings are in the digestive system of flatworms?

2 answers:

5 0

How many openings are in the digestive system of flatworms? Answer: 1

Flatworms digestive system is called 2-way which mean the same opening is used for eat and removing waste. That's why it only has one opening. Human system is one way since we eat from the mouth and remove waste from the anus.

umka21 [38]3 years ago

3 0

There is only one opening in the digestive system of flatworms.
This opening is also used for as a mouth. Mouth of the flatworms opens into gastrovascular cavity. Platyhelminthes is a Flatworms who uses mouth, pharynx and intestine for its digestive system. They have only one opening which is also their mouth, no anus, this makes their digestive track incomplete.

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Santi is walking barefoot through his yard when he steps on a sharp rock. The skin on the bottom of his foot sends

Travka [436]

Answer:

Santi is walking barefoot through his yard when he steps on a sharp rock. The skin on the bottom of his foot sends this information through a(n) sensory neuron to his CNS. A(n) interneuron picks up this information and carries it to motor neurons of the CNS, which sends a signal to the muscles in his foot causing his foot to pull away from the rock.

Explanation:

The scenarios discussed in the question is known as a reflex action. In this action, specific receptors detect specific stimuli. For example, pain in the barefoot due to steeping on a sharp rock was the stimuli. This stimulus was detected by the sensory neurons. The sensory neurons turned this information into a chemical signal which was transported by the interneurons to the motor neurons of the CNS. The CNS detected the signal and gave information for a response as a result of which Santi pulled back his feet.

5 0

3 years ago

Read 2 more answers

How did these scientists' findings and publications relate to the commonly held beliefs of the day?

Karo-lina-s [1.5K]

Thomas huxley = his findings made the theory of evolutions became widely accepted
Ernst Mayr = the one who proposed Biological species concept
Herbert spencer = found similarities between societies within humans and animal
Stephen Gould = the one who contributed to the study of fossils

hope this helps

7 0

3 years ago

_______ look at the genetic tendencies that we share as a species, whereas _______ explore human genetic differences.

Reika [66]

Answer;

Evolutionary psychologists; behavioral psychologists

Evolutionary psychologists look at the genetic tendencies that we share as a species, whereas behavioral psychologists explore human genetic differences.

Explanation;

-Evolutionary psychology is a theoretical approach to psychology that attempts to explain useful mental and psychological traits such as memory, perception, or language,as the functional products of natural selection. Evolutionary psychology is focused on how evolution has shaped the mind and behavior.

-Behaviorism is concerned with how environmental factors affect observable behavior. The behaviorist approach proposes two main processes whereby people learn from their environment: namely classical conditioning and operand conditioning.

3 0

3 years ago

Scientists use tools too _____ . A.) Collect and analyze data B.) Compare theories and laws C.) formulate and adjust theories D.

bekas [8.4K]

The answer is d but i am not sure.

5 0

3 years ago

In fruit flies, curved wings (w) are recessive to the dominant straight wings (W), and ebony body (b) is recessive to the domina

lara [203]

Answer:

The correct answer =

parents : WwBb x wwbb

offspring :

WwBb, Wwbb, wwBb, and wwbb

Explanation:

It is given that the straight wings (W) is dominant over curved wings (w) and the ebony body (b) is recessive to the dominant gray body (B) and there is a cross between curved wings and ebony body and straight wings and gray body is made. The phenotypic ratio is: 1:1:1:1 for the four different phenotypes straight gray, straight ebony, curved gray, curved ebony.

It is not given the genotype of parents, however, for the curved and ebony fly, it is clear that both alleles are recessive as recessive alleles only appear in absence of the dominant allele of the trait.

For another parent, the possible genotypes can be WWBB or WwBb, however in the case of WWBB the phenotypic ratio would not be equal therefore,

crossing WwBb x wwbb

This can be represented in the form of a punnett square as below:

wb wb wb wb

WB WwBb WwBb WwBb WwBb Straight wing, Gray body

Wb Wwbb Wwbb Wwbb Wwbb Straight wing, Ebony body

wB wwBb wwBb wwBb wwBb Curved wing, Gray body

wb wwbb wwbb wwbb wwbb Curved wing, Ebony Body

The phenotypic ratio is: 1:1:1:1 for the four different phenotypes

4 0

2 years ago