Another name for unicellular organisms that dominated Earth up to the Precambrian time is

A. cyanobacteria.

B. stromatolites.

C. eukaryotes.

D. prokaryotes.

How would a problem with the respiratory system could directly affect the cardiovascular system

Suppose that a small mainland tortoise and a large island tortoise are placed in the same pen at a zoo. which tortoise will be more poikilothermic, the small or large tortoise?

Consider three different species of wild cats. Populations of species A are spread evenly across Africa, species B is scattered around the whole of Australia but its population is relatively large in numbers and the population of species C lives on

The element was poisonous to the first forms of life on earth until they evolved to take advantage of it by using cellular respiration. What is it? A. Hydrogen B. Nitrogen C. Oxygen D. Sulfur

In mammals the digestive tract is made up of multiple ... such as the stomach, pancreas and intestines. These all work together to form the ... we use to digest food.

Tissues in the ___ system secrete mucous as part of the first line of defense

Sea anemones trying to occupy the same territory in a tide pool. What type of interaction, predation, competition, mutualism, parasitism, or commensalism?

Assuming the carbon cycle is a closed system, which of the following statements is true?

Which two actioms happens when bonds in ATP moecules are broken

Which genetic condition is found at an unexpected high frequency among the hopi native americans?