What tools might you use to observe birds

How is a scientific theory developed?

Antibiotics are used to treat bacterial infections. Antibiotics can work by either killing bacterial cells or by preventing the spread of bacteria. Antibiotics can kill bacteria by inhibiting bacterial cells from completely forming a cell wall.

Why is it difficult to place marella in any of the subphylum of living arthropods?

For a given gene in a population, there are two alleles, A and a. The frequency of the dominant homozygote, AA, is 0.50; the frequency of the heterozygote, Aa, is 0.20; and the frequency of the recessive homozygote, aa, is 0.30.

What's one indirect consequence of building seawalls? A. It rises the sea level, which infiltrates groundwater aquifers. B. It causes an excess amount of fertilizer to become stuck in the sand. C. It increases the frequency of algal blooms. D.

Describe the movement of "air" into and out of the respiratory system. Be sure to include the following structures (larynx, trachea, bronchi, bronchioles, and alveoli) while being specific about whether it is mainly oxygen or carbon dioxide moving

How are diffusion and osmosis different? A. Osmosis is the movement of proteins. Diffusion is the movement of water. B. Osmosis is the movement of water. Diffusion is the movement of chemicals and molecules. C.

Water molecules exhibit a property which enables them to stick to each other. What is this property referred to as? Polarity Cohesion Adhesion

Using hooke's, F spring = K*E, law find the distance a spring with an elastic constant of 4 n/cm will stretch if a 2 newton force is appied to it. A. 4 cm B. 2 cm C. 1/2 cm D. 8 cm

Mendel discovered that yellow seed color in pea plants is dominant to green. what offspring genotype probabilities are expected for a cross between a plant that produces yellow seeds (heterozygous genotype) and one that produces green seeds