To be clasified as an animal an organism must you have a backbone

What is am enzyme used for?

The process of evolution, or genetic change over time, has resulted in the wide variety of living things that exist today.

The site of photosynthesis in a plant cell is the what

What is the purpose of the nervous system?

What are the two primary photosynthetic pigments found in plants, algae, and cyanobacteria?

What would happen if a keystone species is removed from an ecosystem

Which material will displace a volume of water? all of them cork and wax iron, lead, and aluminum none of them Which material will displace a volume of water less than its own volume?

Why is mitosis responible for for growth, repair, and maintence

Explain one way in which a hormone can prevent contraception

1) Which of the following explains why a bone in a bird's wing is homologous to a bone in a lizards leg? A) The bones in the two species provide for the same type of motion.