Biology, 05.08.2019 18:20, kylieweeks052704

all triploblastic animals are:
a) eucoelomates
c) radially symmetrical
b) schizocoelomates
d) bilaterally symmetrical
a book says that it is d but i feel like it is a
clarify if i am wrong

Answers: 3

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The answer is D (although the way it is worded is a little off)

Not all triploblasts are eucoelomate (true coelom/body cavity surrounded entirely by mesoderm). There are two main phylums which are counterexamples: Platyhelminthes (flatworms) and Nematoda (roundworms). Flatworms are acoelomate (lack a coelom) while nematodes are pseudocoelomates (they have a false coelom, surrounded with both mesoderm and endoderm).

B is incorrect because most are not radically symmetrical, a good example being Chordata (including humans)

C is incorrect because schizocoely occurs mostly in protostomes (although some deuterostomes have it too). Schizocoely is when a mass of mesoderm cells migrate to form the coelom, which doesn’t happen in all embryos.

Letter D is the answer. Although there might be some misconceptions about this, mainly Echinodermata, which are radially symmetrical as adults. However, their larvae develop with bilateral symmetry, so letter D should say “bilateral symmetry at one point in their lives.” But bilateral symmetry is present in all triploblasts, which is why letter D is the answer.

Hope that helped! If I made a mistake, please let me know and I’ll amend my response.

answered: Guest

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust. the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles. three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.

answered: Guest

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.