Red blood cells have cell membranes that allow water, oxygen, carbon dioxide and glucose to pass through. all other materials are blocked form entering. this makes the membrane

Heat that flows by conduction is the transfer of thermal energy between substances in contact. For this to happen, what must occur?A) The two systems must be the same temperature.
B) The two systems must not be touching each another.
C) One system must have higher kinetic energy than the other system.
D) The thermal energy of one system must be the same as the thermal energy of the other system.

A biology student is studying ways to grow crops in soils that are high in salts and other dissolved solids. To determine whether corn plants can tolerate salty soil conditions, she grows 50 corn plants in typical garden soil and the same amount of corn plants in garden soil plus varying amounts of salt: 0.01 kg, 0.1 kg, and 1 kg of salt. After 6 weeks of growth, there was an inverse relationship between amount of salt in the soil and plant height: the more salt present, the shorter the plants. The student concluded that salt had did have an effect on the growth of corn. What was the control in the experiment?

what would most likely happen to cells placed in fresh water. Would water flow out of them because they are hypertonic to the external environment.

What is land pollution?

LWhat is the nature of chromosomes that align themselves on the metaphase plate in metaphase I?A: pair of sister chromatids facing opposite poles

B: pair of nonsister chromatids facing opposite poles

C: pair of tetrads facing opposite poles

How many times larger is the number of hydrogen atoms than oxygen atoms in a molecule of glucose ?