Humans, mice, and whales are all mammals. Which is one characteristic of mammals that separates them from other classes of animals?
A.
They are smart.
B.
They care for their young.
C.
They have hair or fur.
D.
They can live in cold climates.

Which type of respiration takes place when there is no oxygen present

Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight. if you were asked to graph this data, what would you place on the x-axis? a. fertilizer b. water c. plant growth d. week one

Ascience research group is testing a new type of plant food. one trial is conducted in a controlled experiment. the data from the trial show that the plant that received the new food grew faster than the control plant. the group announces that the new plant food makes plants grow faster. what is the main weakness in this scientific claim?