In some instances meiosis of a primary spermatoctye with six chromosomes results in two spermatozoa that contain four chromosomes and two spermatozoa that contain two chromosomes. Predict the most likely cause

Which event provides evidence that matter can bend light waves? A. Light waves travel at a speed of about 300,000,000 m/s in empty space. B. Green plant leaves absorb the red light waves found in sunlight. C.

Which organelle has a double membrane? A) vacuole B) nucleolus C) mitochondria D) ribosome

The similarities between identical twins

Match these items. 1. an atom that has gained or lost electrons 2. produces OH - ions when added to water 3. produces H + ions when added to water Acid Base Ion

Does the type of liquid affect how fast an ice cube melts?

One reason common names are not useful to biologists is that they ... A. are in Latin. B. can apply to more than one animal. C. are too long. D. require the use of a dichotomous key. what is the answer nd why?

A species of butterfly has alleles for wing color that are either blue or orange. When a blue butterfly and an orange butterfly mate, their offspring have wings that are both blue and orange. Explain the process through which wing color is expressed.

Low blood levels of oxygen can bring on? A. Sneezez B. Hiccups C. Coughs D. Sighs

How do human activities increase the occurrence of species extinction?

Describe Coriolis effect and explain why it affects ocean currents.