An alien or invasive species can:

a) cause economic or environmental harm

b) cause humans harm

c) have no natural predators

d) all of the above

If a sound wave speeds up and its frequency does not change, what happens to the wavelength?

Suppose you wanted to determine whether you had adequately sampled the species richness of a given community. Which result would lead most strongly to the conclusion that the current sampling had adequately assessed the species diversitya.

What are the standard units used to report stress and strain in the english system? in the metric or si system?

This scientist established a set of criteria to determine if a microbe is the cause of a specific disease.

An early biological theory stated that a change in a population can occur when organisms with favorable variations for a particular environment

there are four trophic levels in a food chain: Algae, salmon, bears and humans. if algae produce 6500 kj of energy, calculate the amount of energy that is passed on to each trophic level

Animal cells are permeable to water and urea but NOT to sucrose. The inside of a cell contains 1 M sucrose and 1 M urea and the outside 1 M sucrose and 2 M urea. After the system reaches equilibrium, what changes are observed?

How has human activity impacted the evolution of the peppered moth?

Which feature of sugarcanes suggests that they are stems? The presence of scaly leaves and axillary buds A high quantity of sugar The development of adventitious roots

How was the wildlife affected by hurricane sandy in 2012