The largest threat to global biodiversity, as identified by the International Union for Conservation of Nature (IUCN), is
A) habitat destruction.
B) global warming.
C) lack of farmland.
D) introduced species.
E) phosphate pollution.
A
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If the gene pools of allopatric populations did not differentiate much during geographical separation, then upon
reestablishing contact, the populations may interbreed and merge into one. This phenomenon is called ____.
a. species clustering b. divergence c. hybridization d. species fusion
e. convergence_______ is a type of simple plant tissue that is known for photosynthesis, storage, and secretion
a. vascular b. parenchyma c. collenchyma d. sclerenchyma e. dermal
What is the emergence of a plant embryo from a seed?
What will be an ideal response?
Which description best supports the endosymbiotic theory of organelles?
A. Eukaryotic cells acquired mitochondria and plastids by engulfing free-living bacteria and developed a symbiotic relationship with them. Mitochondria were derived from aerobic bacterium while chloroplasts were derived from cyanobacterium. B. Eukaryotic cells acquired mitochondria and flagella by engulfing free-living bacteria and developed a symbiotic relationship with them. Mitochondria were derived from aerobic bacterium while flagella were derived from motile bacteria. C. Eukaryotic cells acquired mitochondria and plastids by engulfing free-living bacteria and developed a symbiotic relationship with them. Mitochondria were derived from anaerobic bacterium while chloroplasts were derived from aerobic bacterium. D. Eukaryotic cells acquired nuclei and flagella by engulfing free-living bacteria and developed a symbiotic relationship with them. Nuclei were derived from aerobic bacterium while flagella were derived from motile bacteria.