Which is the change in size of a group of organisms of the same species over time?
population growth
death rate
birth rate
immigration and emigration

answer: every time you get a disposable straw, it eventually gets thrown away. many of these straws, along with other plastic trash, ends up in the ocean, where it can harm or kill sea turtles and other marine wildlife. straws can get up a sea turtle's nose, or a sea turtle can eat the straw, because it thinks it's food.

they are known to reach a speed of 21 miles per hour

i think the answer would d

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.