If all land on Earth was still connected how would this affect biodiversity​

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?

Pentane with molecular formula c5h12, exists in three isomeric forms. one shows linear carbon chains, another has one -ch3 groups present on the third carbon atom, and the third has two -ch3 groups present on the second carbon atom. what types of isomers are these? a. geometric isomers b. structural isomers c. halotropic isomers

How does photosynthesis show the conservation of mass and energy?