If a scientist finds the remains of a plant between a rock layer that

contains 400 million-year-old Phacops fossils and a rock layer that contains

230 million-year-old Tropites fossils, how old could the plant fossil be?

Reflexes may be coordinated by the brain or by the spinal cord. In reflexes co-ordinated by the brain, there are no relay neurones. Suggest why there is a difference in the mean speed of the impulse for the two reflexes.

Which phase of the cell cycle comes before the prophase stage of mitosis? (1) Anaphase (2) First gap (3) Synthesis (4) Second gap

How long and how frequently should cold be applied to the injured area during the first 24 to 48 hours?

Which phase of mitosis involves the coiling of chromosomes, breakdown of the nuclear envelope, and the movement of centrioles to opposite poles of the cell?

Hunting lions has been banned in some parts of Africa. If this law is enforced, what can we expect to happen to the populations of small mammals in the same locations? A) The small mammal populations will decrease.

The "sphere" that includes all of the water in, on, or around the Earth is the A. biosphere. B. exosphere. C. geosphere. D. cryosphere. E. atmosphere. F. hydrosphere.

What is the arrangement of phospholipids in the plasma membrane

The percentage of energy that flows from one trophic level to another is?

True or false covalent bonds take place between 2 non metal elements

In peas, yellow color is dominant to green. What will be the colors of the offspring of the following crosses? a. homozygous yellow x green b. heterozygous yellow x green c. heterozygous yellow x homozygous yellow d.