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Catc Catc
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6 years ago
The germ layers are formed in which stage?
 
  a. cleavage
  b. fetus
  c. gastrula
  d. zygote
  e. blastula

Question 2

Which soil component(s) have a negative charge that attracts positively charged mineral ions in soil water?
 
  a. sand
  b. silt and sand
  c. clay
  d. humus
  e. clay and humus
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mapmap
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6 years ago
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Catc Author
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6 years ago
Now I'm convinced to ask more questions Slight Smile
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