According to cell theory, viruses are considered nonliving because they
a. do not contain organelles.
b. do not contain organic compounds.
c. cause diseases in other organisms. eliminate
d. lack the ability to reproduce without a host.

1. isogamy 1 organisms with gametes of the same size and shape 2. anisogamy organisms with gametes of different sizes and shapes 3. oogamy 2 organisms with gametes of the same shape but different sizes 4. gonads gamete-producing organs in lower plants 5. gametangia gamete-producing organs in animals