Which statement is not an example of intercellular communication? A A message is distributed across plasma membrane.
B A message travels between gap junctions.
C A molecule stimulates a target cell via a receptor.
D An electrical signal causes muscle cells to contract together.

In a classic experiment using pea shape, mendel conducted two separate genetic crosses. in the first cross the parent plants were “true breeding” for pea shape; one had round peas ( r )and the other had wrinkled (r). the first cross produced a filial 1 generation of all round peas. in the second cross, mendel bred plants from the filial 1 generation. this cross produced different results. out of approximately 1000 plants, about 75% were round and 25% were wrinkled.

Long-period comets come from the oort cloud particles in earth’s atmosphere material from the asteroid belt the kuiper belt

Explain how scientists use geologic time to determine the age of landforms.