Why do viruses need a host cell to survive?

Regarding the endothelium, what is the difference between healthy vessel walls and those that promote clot formation?

True or false: the "a" round of financing is considered lower risk than an ipo. a. True b. False

Sodium ions move into cells from areas of low concentration to areas of high concentration. Which of the following processes is used to move the sodium ions? A. Passive transport B. Active transport C. Diffusion D. Osmosis

How many amino acids exsist

Predatory and parasitic relationships both involve two different species. What is similar about both a predatory and parasitic relationship?

What is the role of carrying capacity in an ecosystem?

A pea plant with yellow seeds is cross with a pea plant with green seeds. all of the off spring have yellow seeds.

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Which is an example of homeostasis? A) release of insulin after a meal B) shivering in the cold C) sweating after exercise D) All of the above

Which statement best illustrates the concept of the interrelationship of living things with the physical environment, as found in the definition of ecology? A) Hawks and eagles often compete with each other. B) White-tailed deer shed their antlers.