Which is NOT a part of cell theory? A. The basic unit of life is a cell.
B. All cells are produced from other living cells.
C. All cells need light to live.
D. All organisms are made of cell.

*will mark brainliest* certain species of are now recognized as indicators of environmental pollution. a. lichen b. mushroom c. yeast d. none of the above

What was dr. willem johan kolff’s first step in using the scientific process to invent the hemodialysis machine? he built the machine and tried it with various patients, collecting data about its effectiveness. when a patient’s kidneys failed, he wondered if it would be possible to perform kidney functions with an external machine. he researched and collected data about numerous patients who exhibited symptoms of kidney failure. he drew conclusions from studies of various symptoms of kidney failure, and drew a design for the ideal external blood-processing machine.

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating