The new, high-yield crops require which of the following that cannot be supplied by subsistence

agriculture?
a. irrigation
b. pesticides
c. fertilizers
d. fossil fuel energy
e. all of these


E

Biology & Microbiology

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Pollen tubes 

A. transport pollen to the stigma. B. facilitate the growth of pollen. C. package sperm into pollen granules. D. allow sperm to fertilize the egg. E. are present during spermatogenesis.

Biology & Microbiology

The key specializations that occurred in the evolution of mammals include all of the following except 

A. warm-bloodedness. B. the presence of a placenta in most. C. different teeth suited to their diet. D. digestive tract specialization. E. reduction in brain size.

Biology & Microbiology

The variable phenotypic expression shown in camptodactyly results from the interaction of ____________________

and ________________factors Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

An aligned pair of homologous chromosomes is called a

A) chromatid. B) spindle. C) tetrad. D) coenocyte. E) gamete.

Biology & Microbiology