Sponges lack _____.

Unwise use can turn renewable resources into _____.

Unwise use can turn renewable resources into _____.

Habitat loss, the spread of a fungal disease, climate change, and pollution are causing severe population declines and extinction in _____, which are cold blooded organisms that lay eggs in water.

Fibroblasts secrete

Habitat loss, the spread of a fungal disease, climate change, and pollution are causing severe population declines and extinction in _____, which are cold blooded organisms that lay eggs in water.

Two or more tissues working together form ______.

Two or more tissues working together form ______.

The organs that produce sperm are the ovaries.

The gradual colonization of barren rocks is called _____.