What are the advantages of producing gametes within a flower?
What will be an ideal response?
This helps with reproduction on land because the male gamete and the embryo are produced within waterproof coats. This allows the plant to invade drier environments. In addition, the sperm can be released within the female gametophyte.
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The most important events in human development occur during the ____
a. week before birth b. month before birth c. first trimester d. second trimester e. third trimester
The disassociation of water molecules following irradiation is termed _____.
a) radiolysis b) ionization c) cross-linking d) point mutation
Which type of digestion begins as a result of our teeth chewing food into small pieces?
A) synthetic B) chemical C) enzymatic D) mechanical
The most common form of calcium has 20 protons, 20 nuetrons and 20 electrons. Which of the following element is an isotope of calcium?
a. an atom with 21 protons, 20 neutrons, 21 electrons b. an atom with 20 protons, 20 neutrons, 18 electrons c. an atom with 21 protons, 21 neutrons, 21 electrons d. an atom with 20 protons, 21 neutrons, and 20 electrons