A spongeʹs structural materials (spicules, spongin) are manufactured by the

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#Question id: 6954

#XL - T Zoology

Between fertilization and the first cleavage division, actin filaments pull the cytoplasm of the frog egg toward the point of sperm entry in a process called:

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#Question id: 19753

#XL - P Chemistry

When molecule is form by chemical bonding between atoms then

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#Question id: 9617

#XL - R Botany

The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed 3-chambered hearts (2 atria, 1 ventricle). Birds and mammals, however, are alike in having 4-chambered hearts (2 atria, 2 ventricles). The 4-chambered hearts of birds and mammals are best described as

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#Question id: 19649

#XL - P Chemistry

Which of the following can be used as the halide component of a Friedel craft reaction?

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#Question id: 18005

#XL - S Microbiology

Which structure is common to both gymnosperms and angiosperms?