Explain Alfred Werner's concept of pangea

Describe in your own words what cell respiration is and why it is needs

Name three characteristics of the cells that make up the muscle tissue in the heart.

List five introduced species that present a serious threat to their new communities. explain the damage done by each introduced species.

What factors affect population distribution in a region?

What is the difference between an element and a compound? an element contains just one type of atom, and a compound contains two or more types of elements an element contains just one type of atom, and a compound contains just two types of elements

Which two processes result in variations in sexually reproducing species? (1) mutation and genetic recombination (2) mitosis and natural selection (3) extinction and gene replacement (4) selective breeding and cloning

How was the amount of food caught by a heron related to change in biotic and abiotic factors?

Which ecosystem demonstrates the lesser biodiversity? Why?

A particular tissue was discovered to have cells that lie in small chambers, separated by a matrix that is solid yet flexible, and fibers that could be stretched while still being able to return to their original length. Name this tissue.

What does the lac operon in bacteria code for?