Question

In: Biology

1. Anatomical similarities between the hearts of birds and mammals are the result of homology true...

1. Anatomical similarities between the hearts of birds and mammals are the result of homology

true or false

2.whocg of the following trends is seen in the evolution of life

a)increase in complexity

b)increase in the number of tissue layer

c) evolution of adaptations

d) shift form aquatic to terrestrial habitats

e)all of the above

2) all of the following groups contain asexually reproducing organisms expect

a)cnidaria

b)insecta

c)mamalia

d)eubacteria

e)algae

3.which of the following is your closest relative

a)sea star

b)oligochaete

c)lancelet

d)clam

e)flatworm

Solutions

Expert Solution

1.  Anatomical similarities between the hearts of birds and mammals are the result of homology. True. Homologous organs are those that have similar anatomic arrangements but differ in function. Thus, the statement is true.

2. e) All of the above. As evolution has occured, the organisms have become complex compared to previous life worms. In turn, this has helped them adapt to various environments. Shifting from aquatic environment is one such example. As we see that live first evolved in oceans, and then the land inhabiting organisms came into being. Complexity has also increased on a molecular level.

3. c) Mammalia. All organisms belonging to mammalia group reproduce sexually. Rest all the groups belong to invertebrates and can reproduce asexually as well. Sexual method is preferred when conditions aren't favourable for asexual reproduction.

4. c) Lancelet. It belongs to phylum cephalochordata and is a primitive chordate. The notochord extends into the head, gill slits and a dorsal nerve chord. These features are quite similar to vertebrates.


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