Which of these are the correct base pairs in DNA?

adenine and uracil

cytosine and guanine

cytosine and adenine

thymine and guanine

Which of the following best explains what would happen if there were no autotrophs in an ecosystem?

Write a paragraph explaining how the classification system organizes object or other things. Relate how you classified items, using the terms from Linnaeus's Classification system.

What part of the plant makes it's food

Maria is concerned because she has been exposed to a small amount of radiation during an X-ray. What is her doctor most likely to tell her

What is a sound wave?

What's a primary consumer

After plants absorb energy from the sun the energy gets converted into blank energy for the plant to carry out life activities

A type of succession in which an ecosystem damaged by fire is reestablished

Major functions of digestive system

The fact that two strands composing a dna molecule are called antiparaellel has to do with the orientation of the