Flu shots are vaccines against the most common strains of the flu virus. most vaccines are rarely changed but new flu vaccines are produced every year. why are flu shots constantly being reformulated? the flu virus is not completely known.

Why is the Transfer of energy and matter in a food chain only about10 percent efficient?

The first step in restoring pine woodlands is prescribed burning. T or F

How do proteins work?

Define the following terms in your own words food chain, food web and energy pyramid

Somatic cells of chimpanzees contain 48 chromosomes. how many chromatids and chromosomes are present at (a) anaphase of mitosis, (b) anaphase i of meiosis, (c) anaphase ii of meiosis, (d) g 1 prior to mitosis, (e) g 2 prior to mitosis, (f) g 1 prior

What are 4 characters used to decide a population

Alternative energy sources come from renewable processes. true or false?

Choose the best synonym to replace the underline word in the sentence below: These fossil fuels emit carbon dioxide into the air, contributing to global warming. a. burn c. release b. allow d. expire

John wants to test how temperature affects the mass of sugar that can be dissolved in water. Which of the following factors will John expect to change in response to the differences between the control group and the experimental group? O A.

The lion's scientific name is Panthera leo. The leopard's scientific name is Panthera pardus. The tiger's is Panthera tigris. Which statement is true? A) All 3 animals share a genus. B) All 3 animals share a species.