A scientist has analyzed the chemicals that make up a sample of an unknown substance. Which chemicals would be the best indicator that the unknown substance is a plant

Intense uv light from the sun is lethal to living things. currently, some 99% of all incoming uv is blocked by the ozone layer which didn't develop until well after the first life-forms.

What is the main way heat is transferred in the troposphere?

Each child born to a particular set of parents has probability 0.25 of having blood type o. if these parents have 5 children, what is the probability that exactly 2 of them have type o blood?

One sugar produced by photosynthesis is

Which stimuli is detected by a chemoreceptor?

Describe two ways in which communication in the endocrine system and in the nervous system are different and one way in which they are similar.

One of mrs. morgan's fractures is described as being located on the proximal diaphysis. which of these phrases best describes the anatomical location of this fracture?

When a cell divides in mitosis, how do the daughter cells compare to each other?

What is one main human activity that causes smog, acid rain and contributes to global warming?

Filtration requires hydrostatic pressure. a. True b. False