Why do plants need nitrogen?

What are the two groups that are adapted to anaerobic conditions and contain modified mitochondria that lack dna?

What is colic? describe at least two different types of colic?

People with a lactose intolerance are able to take products such as lactaid that contain the lactase enzyme with their meals. these products can be taken in pill form.

During wich process is ethanol produced A:lactic acid fermentation B:alcohol fermentation C:citric acid cycle D:electron transport chain

The process by which a sperm cell combines with an egg cell is called

Which two strata of the epidermis are most susceptible to cancer?

What term best defines the process that occurs when nuclei combine to produce a nucleus with more mass? a. fusion b. fission c. anti-synthesis d. atomic recombination

Which of these is an advantage of wind energy? A. It reduces bird and bat populations. B. It generates noise pollution. c. It generates electricity. D. It increases greenhouse gas emissions.

a group of of scientists is studying the internal parts of a cell. which microscope is most appropraite for these scientist to use

Which of the following choices is a biotic factor in the ecosystem? sunlight, water, deer, soil