What is the key concept addressed by the question?
What will be an ideal response?
The question is about different forms of selection.
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An embryo sporophyte surrounded by nutritive tissue and then a tough, protective outer coat makes up
a(n) ____ that shelters the embryo from drought, cold, and other adverse conditions.
a. pollen grain b. spore c. ovule d. seed e. strobilus
Invisible living creatures were thought to exist and cause disease long before they were ever observed.
Answer the following statement true (T) or false (F)
Primordial germ cells can be found in the ________ of the developing female embryo
A) yolk sac B) allantois C) placenta D) chorion
If one compares the base sequences of related genes from different species, one is likely to find that corresponding ________ are usually conserved, but the sequences of ________ are much less well conserved
A) exons; introns B) introns; exons C) introns; proteins D) chaperons; exons E) introns; chaperons