What is an ecological system called that consist of all of it to biotic and abiotic factors? a. community b. ecosystem c. habitat d. pure culture

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

True or false: (a) the strings of little red dots represent carbohydrates. (b) the model is called a bilayer because there are two main types of molecules present, lipids and proteins. (c) the many black lines represent amino acid tails. (d) this model shows membrane transport. (e) the blue ovals are hydrophobic. (f) the blue ovals represent phospholipid heads.

Which of the following is not a type of epithelial cell