The stage that scientists begin to ask questions and attempt to explain observations is A. forming hypotheses. This is because a hypothesis is basically a testable question about observations scientists make.
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The renal corpuscle consists
of a capillary bed called the glomerulus and a capsule of epithelial cells.
The renal corpuscle is composed
of two structures, the glomerulus and the Bowman's capsule. The glomerulus is a
small tuft of capillaries containing two cell types. <span>It is also characterized
as a cluster of capillaries around the end of a kidney tubule, where waste
products are filtered from the blood. Other
surfaces that separate body cavities from the outside environment are lined by
simple squamous, columnar, or pseudostratified epithelial cells.The gastrointestinal tract, the insides of the lungs, and the
reproductive and urinary tracts where other epithelial cells line up make up
the exocrine and endocrine glands.</span>