A two kingdom system of classification was used until which decade

The study hypothesized that pregnant women who exercise during their pregnancies would score lower on the center for epidemiologic studies depression scale (ces-d) than sedentary pregnant women. what type of hypothesis is this

The tool most effective at monitoring the anaerobic conditions caused by sudden spikes in the population of algae in a lake is the A) rain gauge. B) Secchi disc. C) thermometer. D) dissolved oxygen meter.

How do sharks blend with the ocean?

Do animal cells have cell walls?

Energy is the ability to do work or cause A events B change c friction D explosions

Identify another invertebrate chordate other than hagfish.

If an amino acid has a side chain (r group) that is charged (i. e. bears a full + or - charge), which amino acid group would it belong in?

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?