Suppose that a population of bacteria triples every hour and starts with 400 bacteria. find an expression for the number n of bacteria after t hours.

Natural selection causes ... a: plants and animals to produce more offspring than can survive b:changes in the environment c:only favorable traits to exist in a population d:changes in the frequencies of certain alleles in a population

Which of the following uses the largest amount of water per day? - public supply - self-supplied industrial - thermoelectric power - mining

Genetic variation in a population of animals or plants depends mainly on which of the following? A) the organism being haploidB) sexual recombinationC) migration of genes among the chromosomesD) mutation

A patient complains of leg pain that wakes him at night. he states that he "has been having problems" with his legs. he has pain in his legs when they are elevated that disappears when he dangles them.

What is a members of one kind of organism in an ecosystem

These are organisms that are brought into a new environment, sometimes accidentally, sometimes on purpose; and have no natural enemies or controls.

You decide that the introduction should also discuss the extremophiles that are referred to as the archaea.

Banff and Minsk are located at similar latitudes. What could account for Banff's average yearly temperature being lower than Minsk's?

What you think can be done to reduce levels of carbon dioxide in the atmosphere

Alzheimer's and Parkinson's are both diseases affecting the central nervous system and they share some similar characteristics.