When one or more pairs of valence electrons are shared by 2 neutral atoms, what type of bond is formed?
a. ionic bond
b. hydrogen bond
c. electronegative bond
d. a covalent bond
Ans: d. a covalent bond
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Infants acquire natural passive immunity from maternal antibodies transferred across the placenta or in breast milk
Indicate whether the statement is true or false.
a. a diploid zygote
a. a seed plant with seeds exposed on modified leaves b. a structure that produces vessels in woody tissue c. a sac-like structure at the tip of the stamen d. a seed plant with small spores that produce gametophytes
What part of our skeleton most resembles an exoskeleton?
What will be an ideal response?
Which of the following is TRUE concerning
seeds?
a. Present-day ferns produce seeds. b. Seeds contain an immature sporophyte. c. Pollen grains mature into seeds. d. Seeds contain a food source. e. All of these are true