The bottom area of a pond or lake where very little sunlight reaches is the

O trophic zone

O plankton zone

littoral zone

O benthic zone

Which kind of tissue sends messages from the brain to the rest of the body?

How many different shapes of bacteria are there? 1 shape 2 shapes 3 shapes 4 shapes

Which factor is responsible for the red color of Mars? sulphur dioxide methane iron oxide nitrogen

Biodiversity is the number of species ... a. of animals living within an ecosystem. b. of plants and fungi living within an ecosystem. c. of bacteria and protists living within an ecosystem. d. living within an ecosytem.

A special low-calorie diet consists of dishes a, b and c. each unit of a has 2 grams of fat, 1 gram of carbohydrate and 3 grams of protein. each unit of b has 1 gram of fat, 2 grams of carbohydrate and 1 gram of protein.

What happens to the force of gravity between two masses if one mass is increased A. it stays the same B. it decreases C. it increases D. it fluctuates

How can water intake affect the volume and concentration of urine?

You are a doctor examining a bone sample taken from a patient with weak bones. You find that the bone tissue contains many small pores. This is most likely caused by

In which layer of the epidermis are granules of keratohyalin formed?

In order to keep all other things the same and isolate the effects of one particular variable in the biology experiment, Kate will want to do which of the following? Check all that apply. Offer the same type of food to the rats in each trial.