Which trophic level do anacondas and jaguars fill in the Amazon rainforest? producer primary consumer secondary consumer tertiary consumer

What tools give scientist the best data to study ice loss near the poles? A. Satellite measurements B. Argo floats C. Air bubbles trapped in ice D. I've core samples

Who might be a secondary consumer? pelagic fish marine mammals humans benthic vegetation

Mitochondria and chloroplasts are thought to have evolved from free-living aerobic bacteria that were engulfed by an ancestral anaerobic cell and established a mutually beneficial (symbiotic) relationship with it.

Thousands of species of organisms live in one square mile of tropical rain forest. Which statement is true about those organisms? They all share the same predators. They are all part of the same population. They are all a part of the same community.

Tropism describes a virus’s affinity for specific tissues: A) True B) False

Which part of the neuron is most closely associated with the speed with which it can convey an impulse?

While the human genome shows that we are all in fact very similar to one another at the DNA sequence level, small (and sometimes) large changes do occur.

Fossil A is found in a layer of rock that is lower than the layer that Fossil B is found in. Based on this information, which statement is correct? A) Fossil A is older than Fossil B. B) Fossil B is older than Fossil A.

Why are complex carbohydrates better for storing energy than simple sugars are?

Skeletal muscle contraction begins when calcium ions bind to