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oksian1 [2.3K]
3 years ago
7

The protostome developmental sequence arose just once in evolutionary history, resulting in two main subgroups—Lophotrochozoa an

d Ecdysozoa. What does this finding suggest? _____ Select one: a. These two subgroups have a common ancestor that was a deuterostome. b. The protostomes are a polyphyletic group. c. Division of these two groups occurred after the protostome developmental sequence appeared. d. The lophotrochozoans are monophyletic.
Biology
1 answer:
Lelechka [254]3 years ago
8 0

Answer:

<h2>c. Division of these two groups occurred after the protostome developmental sequence appeared. </h2>

Explanation:

  • Protosomes are such types of organisms in which the mouth part developed first during embryonic development.
  • Those animals in which anus develop first are known as deuterostomes.
  •  This differentiation takes place during the embryonic development of the organisms.
  • Since lophotrochozoan and Ecdysozoa both are protostomes animals and categorized on the basis of molecular evidence.
  • Thus these two groups were formed after the appearance of the protostomes.

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Plz hurry i need this answer
lilavasa [31]

Answer:

<em>The correct option is A) cadmium dosage</em>

Explanation:

In an experiment, an independent variable can be described as a factor which is changed naturally or by us to see its effect on the dependent variable. The dependent variable is the variable which is under study and depends on the independent variable.

In the following experiment, we are checking the effect of different dosages of cadmium on the surviving ability of tadpoles. Hence, cadmium dosage is the independent variable. Tadpole population is the dependent variable.

5 0
3 years ago
Two abiotic factors that affect an ecosystem are:
Free_Kalibri [48]

Answer: water and light

Explanation:

Abiotic factors are non living things that affect biotic factors for an example plants need water and sunlight to live which are abiotic factors

6 0
3 years ago
Based on the diagram above, which organism will have the greatest physical difference from its ancestor?
choli [55]

Answer:lobsters

Explanation:Because they are farther removed

3 0
4 years ago
Round seeds (R) are dominant to wrinkled seeds (r), and yellow seeds (Y) are dominant to green seeds (y). A plant of unknown gen
hammer [34]

Answer:

<h2>RrYy and rryy </h2>

Explanation:

1. As given; Round seeds (R)  are dominant on wrinkled seeds (r),

Yellow seeds (Y) are dominant on green seeds (g).

In a testcross, between an unknown genotype and a homozygous recessive with wrinkled and green seeds (rryy).

offspring are:  

Round and yellow are  53; genotype (R_Y_)

round and green are  49;  genotype (R_yy)  

wrinkle and yellow are 44;  genotype (rrY_)

wrinkled and green are  51 ; genotype  (rryy)

Here, the genotype of parents of these offspring would be RrYy and rryy.

6 0
3 years ago
Which best describes how our understanding of DNA and inherited traits has changed over time
MAVERICK [17]
<h3><u>Answer;</u></h3>

It was developed by many scientists over many decades.

<h3><u> Explanation;</u></h3>
  • DNA is a type of nucleic acid that contains two long, twisted strands, known as double helix, that contain complementary genetic information.
  • A gene is a segment of DNA that is passed down from parents to children and confers a trait to the offspring.
  • The traits an organism displays are ultimately determined by the genes it inherited from its parents, known as genotype.
  • Our understanding of DNA and inherited traits has changed over time since it has been continuously developed by many scientists over may decades.
4 0
3 years ago
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