How many independent variables can be tested in a controlled experiment?

A. one

B. two

C. three

D. as many as you want

Ecologist study the varieties and interactions of A - living things across time B-living things across space C-macromolecules in living systems D - macromolecules in non-living systems

Four boy have the same biological mother and father what percentage of each boys chromosomes come from the mother

Rank the following types of water on Earth, from lowest salinity to highest salinity. A) salt water; brackish water; fresh water B) fresh water; brackish water; salt water C) fresh water; salt water; brackish water D) salt water; fresh water;

An action potential is a. the tiny electrical charge that exists when a. a neuron is neither receiving nor sending information. b. an electrical signal that travels along the axon of a neuron. c. the small gap that exists between adjacent neurons. d.

What will be the frequency of the recessive allele in a population of 100 elephants if there are 70 dominant alleles?

If an object with a mass of 100 kg on earth is taken to a planet that has more gravity, how will this affect the object's mass and weight?

Lamarck's mechanism of change can be called

What is carrying capacity and what does it mean for ecosystems?

Why was the evolution of a coelom a critically important innovation for animals? a) The coelom can act as a hydrostatic skeleton. b) The coelom gives rise to a complex nervous system. c) The coelom made it possible for animals to colonize land.

Marine mammals, with a few exceptions, are a. oviparous b. ovoviviparous c. viviparous