Which is true about ecosystems?

A. Once defined, an ecosystem is a unit scientists can analyze.

B. All ecosystems are the same size.

C. Biotic and abiotic factors are the same in most ecosystems.

D. All ecosystems are identical.

What is homeostatis

How many additional electrons does a hydrogen (H) atom need to complete its outermost energy levels? How many does an oxygen (O) atom need?

All BUT one of the following is a component of nucleic acids. Nucleic acids DO NOT contain A) phosphates. B) amino acids. C) ribose sugars. Eliminate D) nitrogenous bases

Why is DNA replication necessary

Sarah and Jane were playing basketball. They collided and fell. Sarah's knee was lightly bruised. Jane's elbow was scratched, causing a little blood to ooze out.

In 1865, a biologist, St. George Jackson Mivart, constructed an evolutionary tree of existing primate species with many branches based on analysis of spinal columns. But to his dismay, another tree based on limb comparison was quite different.

How does the amount of rainfall affect the amount and types of seeds present on the Galapagos Islands?

If a characteristic is found in bacteria, fungi, pine trees, snakes, and humans, when did it most likely evolve?

Which property allows objects that do not produce their own light to be seen

What is an example of recombinant dna technology?